Trend Micro TippingPointTM

Threat Protection System (TPS)SSL Inspection Deployment Guide
Actionable threat defense against known and zero-day attacks

TM

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Publication: November 2022

Overview
The Threat Protection System (TPS) security device provides in-line, real-time threat protection for inbound
SSL traffic to your web servers and outbound SSL traffic from your clients.
With access to your server certificate and private key, SSL server inspection receives and decrypts SSL data,inspects it using the Threat Suppression Engine, and then encrypts it before sending it to the actual
destination. The TPS manages its own private keys and certificates from the servers it is securing; you caneither store them on the device or access them at run-time using the Security Management System (SMS).

SSL client inspection decrypts and inspects SSL sessions from your internal clients to the server. The SSL
client proxy can use a signing certificate (a CA certificate) to authenticate the SSL session with your client.
SSL sessions involve a negotiation of shared information as in the following sequence:
1.

A client browser requests access to a secure site.

2.

The secure site's server responds with a public key in addition to an SSL certificate with information
about the owner of that site.

3.

The client inspects the certificate to ensure its validity (generated by a certificate authority, not expired,and so on).

4.

The client generates a random symmetric key, which it uses to encrypt private information such as its IP
address.

5.

With the public key it received previously, the client encrypts this symmetric key and sends it back to thesecure site.

6.

The secure site's server decrypts the symmetric key with its own private key to get the client's IP address
and other private data.

7.

The secure site's server then sends to the client the encrypted page along with the symmetric key todecrypt it.

8.

The client and the secure site use symmetric key pairs to encrypt and decrypt all subsequent
communications.

Considerations
When deploying SSL inspection, consider these points:
Consideration
IPv4 traffic only

Description
The TPS inspects inbound IPv4 traffic—including HTTP and HTTPS traffic—to yoursecure servers, and outbound client IPv4 traffic to the Internet. SSL inspection does
not support IPv6 traffic, including IPv4 over IPv6 tunneling.

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Consideration
Tunneled traffic

Description
Supported SSL encapsulations:• GRE (Generic Routing Encapsulation)*• IPv4 (IP-in-IP)• One layer of tunneling only for both GRE and IPv4-in-IPv4. SSL inspection does notinclude support for GTP or IPv6 encapsulations.
*GRE support includes the mandatory GRE fields. Optional GRE key configuration is
also supported but requires the key to be the same value for both directions. SSL
inspection does not support other optional GRE fields, such as GRE sequence number.

Asymmetric mode

SSL inspection cannot occur when asymmetric mode is enabled.

Web mode

SSL inspection cannot occur when web mode is enabled. By default, web mode isdisabled.

Quarantine hosts and redirecting HTTP traffic
to another site

When configuring an Action Set to quarantine hosts, if you also configure the responseto redirect traffic to an HTTP server, the device redirects the HTTP traffic from thequarantined host but does not redirect the HTTPS traffic.

Filter Precedence

The TPS processes filters in the following order of precedence:
1.

Inspection Bypass Rules

2.

Traffic Management Filters

3.

RepDV

4.

Quarantine

5.

Digital Vaccine Filters

When encrypted traffic is routed through the device and SSL inspection is configured,
the TPS order of precedence applies to the decrypted traffic. The TPS does notquarantine or apply Digital Vaccine filters to traffic without first decrypting the traffic.
If SSL inspection is not configured, the device applies Inspection Bypass, Traffic
Management, RepDV, and quarantine filtering against the encrypted traffic. The device
applies Digital Vaccine filters, but they do not match against encrypted payload.
Server Name Indication (SNI)The TPS forwards any SNI sent by the client to the server during the TLS handshake.
This enables the support of HTTPS websites that host multiple sites with possibly
different TLS/SSL certificates under the same IP address. You can configure multiple
certificates in a server proxy for use with SSL server inspection.
To avoid decrypting domains that are not intended to be decrypted, the default
behavior is to trust SNI when it matches a domain that is configured not to be
decrypted rather than using the server certificate to make this decision. This avoids
issues when accessing a site for the first time and when a site has many IP addresses
and subdomains. Contact support for information on how to change this default
behavior.

Non-encrypted traffic when SSL is configured

2•

The TPS device drops non-encrypted traffic flows that match a configured SSL
server tuple (destination port and destination IP address) in the SSL profile but
send cleartext traffic before starting an SSL handshake (as some protocols allow
via STARTTLS).

•

The TPS device drops non-encrypted traffic flows that match a configured SSL
server tuple (destination port and destination IP address) in the SSL profile dueto the lack of an SSL handshake.

SSL Inspection User Guide

Consideration

Description

Conditions when encrypted traffic will not be
decrypted

When you configure SSL, encypted traffic will be decrypted except when the system or
SSL logs indicate the following conditions:•

Decrypted but not inspected – Initial decryption of flow determined that no
subsequent flows to this domain require decryption or inspection.

•

Not decrypted – Flow not decrypted because the domain name matches acategory or domain exception.

•

Bypassed – Flow not decrypted because SSL requirements were not met. Learn
more about SSL requirements.

•

Blocked – Flow that should be decrypted has been blocked.

Security properties for an end-to-end SSL
connection

SSL negotiation on the client side of the TPS proxy is done independently from the
SSL negotiation on the server side of the TPS proxy. Consequently, supported versions
and cipher suites between the two sides of the TPS proxy might not be the same. Eachside can enforce only the rules on its half of the negotiation. Administrators can checkdetails of the negotiation by enabling logging and examining the SSL logs.

Traffic Management filters Trust action

The TPS device continues to proxy the SSL session between the client and the serverwhen HTTPS traffic matches a traffic management filter that is set to Trust (incoming
traffic is trusted and not inspected).

Packet trace

Packet Trace as an action includes the decrypted traffic.

Traffic capture

Traffic capture by tcpdump does not include the decrypted contents.

L2FB/ZPHAThe TPS device will not clear proxied SSL sessions when the device enters Intrinsic HA
Layer-2 Fallback or Zero Power High Availability (ZPHA). To clear proxied SSL sessions,a debug command is required in conjunction with support.

Encrypt-then-MAC

This extension is disabled by default. You can enable this extension using the INI file,
but performance of the TPS will be affected.

Requirements
Make sure your environment meets the following requirements:•

Device support – the following TPS devices support SSL inspection:•

TXE Series devices•

TX Series (5500TX, 8200TX, and 8400TX devices)•

2200T device•

Virtual Threat Protection System (vTPS) (performance mode only, with RDRAND instruction
recommended) security devices. For information about how to deploy the vTPS virtual appliance for
SSL inspection, see the vTPS User Guide.
Note
If you need to configure SSL v3.0 with TLS, always configure all TLS protocols, including TLS v1.0, TLS v1.1,
TLS v1.2, and TLS v1.3. You must enable all SSL protocols between the configured lowest-strength and higheststrength SSL protocols.

•

Licensing – SSL Inspection is licensed separately. To request an SSL Inspection license, contact yoursales representative.
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Cipher suite support – The SMS is capable of configuring the following ciphers if your TOS supports
them. Older TOS versions might have limited cipher support. Profile distribution extended status alerts
you to any errors.
•

Protocols:•

TLS v1.3, v1.2, v1.1, and v1.0 (enabled by default)•

SSL v3.0 (disabled by default)
Note
TLS Heartbeat Extension (https://tools.ietf.org/html/rfc6520) is not supported.

•

Key exchange algorithms:•

Ephemeral Elliptic Curve Diffie-Hellman with RSA signatures (ECDHE-RSA).
The ECDHE-RSA cipher suite extends SSL inspection capability to Perfect Forward Secrecy(PFS). ECDHE-RSA is enabled by default.

••

Authentication algorithm:•••

RSA (enabled by default)

RSA (enabled by default)

Bulk encryption algorithms:•

AES256 and AES128 (enabled by default)•

3DES (enabled by default)•

GCM (enabled by default)•

DES (disabled by default)

Message Authentication Code (MAC) algorithms:•

SHA384, SHA256, and SHA1 (enabled by default)•

CHACHA20 (enabled by default)•

POLY1305 (enabled by default)•

VLAN translation – SSL inspection requires that you do not configure VLAN translation on the device.

•

Asymmetric Network mode – SSL inspection requires that you do not enable Asymmetric Network modeon the device.

License the device
Update your license package to assign an available SSL inspection license to any supported TPS security
device. The SSL inspection license applies to both SSL client inspection and SSL server inspection.
Note
Manage your license package by using the License Manager on the TMC. When you log in to the TMC, the LicenseManager is under My Account > License Manager.

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SSL Inspection User Guide

You can configure the SMS to automatically download updates from the TMC. The SMS downloads the mostrecent license package to the device within 30 minutes. If necessary, manually import the license package.
1.

In the SMS tools, click Admin.

2.

Click Licensing.

3.

In the Licensing workspace, expand your device to view its capabilities.

4.

Ensure that the SSL Inspection capability is assigned to the device and is Allowed. If necessary, the SMS
prompts you to resolve any issues:•

Reboot required – Reboot the device to enable the SSL inspection license.

•

Deny – Verify the license package assigns the SSL inspection capability to the device.
Note
If you intend to configure domain categories for SSL inspection, you must also activate a ThreatDV license. SelectProfiles > Reputation Database > ThreatDV Entries to view your license status and details.

Enable SSL inspection
For each device, update the device configuration to enable SSL inspection and optionally, to retain private key
information. To optimize the available resources on the device, do not enable SSL inspection until you areready to inspect secure traffic.
Before you begin
If necessary, you can disable SSL inspection on the device until you configure SSL inspection options.
Procedure1.

In the SMS tools, click Devices.

2.

Click All Devices > device_name > Device Configuration.

3.

In the Device Configuration workspace, click Edit.

4.

In SSL Inspection options, view the supported SSL ciphers on the device.

5.

Configure the following options:•

Client SSL Inspection – Enables the SSL client proxy to decrypt and inspect your client traffic to theInternet. If the checkbox is grayed, verify the license package has assigned the SSL Inspection
capability to the device.

•

Server SSL Inspection – Enables the SSL server proxy to decrypt and inspect Internet traffic to yoursecure servers. If the checkbox is grayed, verify the license package has assigned the SSL Inspection
capability to the device.

•

Persist Private Keys – Enables private key information to be retained in the system keystore. Bydefault, the device automatically retrieves private key information from the SMS and temporarily
retains the information in memory until the device reboots.

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SSL Inspection User Guide

Configure SSL client inspection
Configure SSL client inspection to decrypt the SSL session between a client on your local network and aparticular website.
The TPS cannot effectively inspect an encrypted payload of SSL client traffic that does not match the SSL
client policy. Learn more about configuring an SSL client policy.
The SSL client policy uses a signing certificate to authenticate the session between the SSL client proxy andyour client. Learn more about generating a signing certficate.
You can configure SSL client inspection so that particular SSL traffic will not be decrypted. During your policy
configuration, specify categories that you want exempted from inspection, such as private financial accountinformation. A ThreatDV subscription is required for configuring categories. Learn more.

Generate a signing certificate
Signing certificates enable the SSL client proxy to authenticate any SSL server certificate to your client proxy.
For full SSL inspection functionality, you must distribute the signing certificate to the endpoints. In Microsoft
Windows environments, use Group Policy Objects (GPO), as described here:
https://docs.microsoft.com/en-us/windows-server/identity/ad-fs/deployment/distribute-certificates-to-clientcomputers-by-using-group-policy
For systems that run Mac or Linux, refer to each vendor's documentation for that operating system's process
and requirements.
Although a signing certificate must be a CA certificate, you import it to Admin > Certificate Management >Certificates because you also need its private key. The SMS performs basic validation on the status of thecertificates itself. If a certificate is not self-signed, remember to import any intermediate CA and root CA
certificates in the signing certificate chain to Admin > Certificate Management > CA Certificates.
All browsers used within the managed environment must trust certificates signed by the signing certificate.
Typically, your IT department deploys the signing certificate across all workstations in the company. If theroot certificate in the signing certificate chain originates from somewhere other than a public CA source, avalid CA certificate (the associated private key is not necessary) must also be distributed to the clients. For
signing certificates that are self-signed, the valid CA certificate to distribute is the signing certificate itself;otherwise, the root CA certificate in the signing certificate chain is the CA certificate to distribute.
When an untrusted site has been accessed, the TPS issues a certificate signed by an untrusted CA certificate.
When this happens, or when the proper CA certificate fails to get distributed to the clients, the client might
display a warning because of an untrusted certificate chain sent by the TPS.
Because procuring a signing certificate from a public CA can be difficult, you can generate a self-signed
certificate for client SSL using the SMS. Self-signed certificates are typically used for personal or test
websites. They cost nothing because you do not pay for an established certificate authority (CA) to sign them.
Because of this, however, all browsers generate an alert when they encounter a self-signed certificate.

61.

In the SMS tools, select Admin > Certificate Management > Certificates.

2.

In the Certificates workspace, click New Signing Certificate.

3.

In the Create Signing Certificate dialog, enter values into the following required fields:•

Name – Name of the Signing Certificate you are creating.

•Common Name (CN) – The common name of the signing certificate.

SSL Inspection User Guide

Optionally, you can also configure values for the following options:•

Key Size – Size, in bits, of the key. A minimum size of 2048 bits is recommended.

•

Valid for – Specify the duration, in days, that the signing certificate is valid.

•

Private key can be exported from SMS – If you intend to use the private key for other purposes,
select this option to enable the key to be exported from the SMS.

•

Email – Email address of the signing certificate.

•

Organizational Unit (OU) – Division within the organization. For example, Research andDevelopment.

•

Organization – Legal, registered name of the organization. For example, National Football
League.

•Locality – City in which the organization is located or registered. Do not abbreviate. For example,
Saint Louis.

•

State – State or province in which the organization is operating. Indicate the state or province inwhich the protected server is operating. Do not abbreviate. For example, Missouri.

•

Country – Two-character ISO format country code of the organization. For example, US.

•

DNS (DNS Name) – Additional domain name of the organization to be covered by the certificate. For
example, login.company.com.

•

User (RFC822 Name) – E-mail address of specific user in the organization. For example,

susan@company.com.

Generate a certificate signing request for client SSL
A certificate signing request (CSR) is a certificate prototype that you generate using the SMS. It can be used toget a signing certificate for client SSL. After you configure all the certificate options, you export it to an
established certificate authority (CA) who signs it. After it is signed, the CA sends you back the certificate. You
then import the signed certificate into your client's certificate repository. This is required for your clients totrust the spoofed server certificates signed by the SSL client proxy.
If your signing request includes a certificate with multiple domains, specify the additional domains in the
Subject Alternative Name DNS (DNS Name) field of the procedure that follows.
Procedure1.

In the SMS tools, select Admin > Certificate Management > Signing Requests.

2.

In the Signing Requests workspace, click New.

3.

In the New Signing Request dialog, enter values into the following required fields:•

Request Name – Name of the Signing Certificate you are creating.

•Common Name (CN) – The common name for the certificate authority the signing certificate will act
as.

You can also configure values for the following options:•

Key Size – Size, in bits, of the key. A minimum size of 2048 bits is recommended.

•

Make it a Signing Certificate – For client SSL, select this option to establish the certificate as asigning certificate.
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Private key can be exported from SMS – If you intend to use the private key for other purposes,
select this option to enable the key to be exported from the SMS after the certificate is signed.

•

Email – Email address of the requester.

•Organizational Unit (OU) – Division within the organization. For example, Research andDevelopment.

•

Organization – Legal, registered name of the organization. For example, National Football
League.

•Locality – City in which the organization is located or registered. Do not abbreviate. For example,

Saint Louis.

•

State – State or province in which the organization is operating. Indicate the state or province inwhich the protected server is operating. Do not abbreviate. For example, Missouri.

•

Country – Two-character ISO format country code of the organization. For example, US.

•

DNS (DNS Name) – Additional domain name of the organization to be covered by the certificate. For
example, login.company.com.

•

User (RFC822 Name) – User email address for the certificate authority organization the signing cert
will be acting as.

What to do next
After you create the request, use the SMS to export the signing request. Then send the request without its
private key to a certificate authority to sign and issue the certificate. You will then import the signed certificatethat the CA sends you into the SMS as a non-CA certificate so that the private key from the signing request
will also be imported.

Export a signing request
After you generate your signing request, export the request to a file so that you can send it to a Certificate
Authority (CA) for signing.
Procedure1.

In the SMS tools, select Admin > Certificate Management > Signing Requests.

2.

In the Signing Requests workspace, select the Signing Request that you created and click Export.

3.

In the Export signing request dialog, select the directory location to export the file.

4.

Send the file to the CA, or upload it to the CA's portal.

What to do next
The CA signs and issues the certificate. After you receive the signed certificate from the CA, save thecertificate file and then import it into the SMS as a non-CA certificate so that the private key from the signing
request will also be imported. The certificate must be installed on the same SMS that issued the request.

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SSL Inspection User Guide

Import a certificate
Import to the SMS the end-point certificate (for server SSL) or the signing certificate (for client SSL) that was
signed by a CA from a signing request, or import any existing signing certificates and private keys thatbrowsers on your network already trust.
Procedure1.

In the SMS tools, click Admin > Certificate Management > Certificates.

2.

In the Certificates workspace, click Import.

3.

Provide values for the fields in the Import Certificates dialog. Note the following guidelines:
Certificate Name
This name must be unique. If you are replacing an existing certificate, you cannot edit this field.
If you are importing multiple certificates using a PKCS12 file, this field indicates the base namefor all the certificates. The final certificate name of each certificate in the PKCS12 file is createdby appending the alias of the certificate to the base name.
Certificate FileClick Browse to navigate to the certificate file on your system.
Certificate Format
Select the certificate format:•

PEM/DER – Base64/binary encoded certificate. Always import the private key in a separate
file. If the private key is encrypted, always enter the appropriate password in the Passwordbox.

•

PKCS12 – Potentially holds multiple certificates. Enter the appropriate password to import
the certificate/key pair. When using a certificate chain, always include any intermediate
certificates in your import file. Only one file can be imported with the certificate/private
key pair and any intermediate certificates.

Note
If the certificates are not self-signed, be sure to also import any intermediate CA and root CA certificates in thecertificate chain to Admin > Certificate Management > CA Certificates.

Import CA certificates
Trusted certificates authenticate the SSL session. Both intermediate and root CA certificates are required forthe certificate chain of end-point certificates and signing certificates used with SSL inspection that are notself-signed. When you add a root CA to your Trust Store, you can then specify CAs that you want to trust otherthan the ones that are in the default trusted CA package. This topic explains how to add your own trusted CA
certificates.
Procedure1.

In the SMS tools, click Admin.

2.

Click Certificate Management > CA Certificates.

3.

Click the CA Certificates tab to import, export, replace, or delete a CA certificate. If you are importing,specify the following information in the Import Certificate dialog:
9SSL Inspection User Guidea.

Enter a certificate name for the certificate being imported.
Note
For the CA certificate name, use alphanumeric (uppercase and lowercase) characters. You can also use
hyphens, underscores, and spaces. If the name has a space in it, enclose the entire name in quotes (forexample "cert 34"). You cannot use any other special characters. Naming the certificate ca is notallowed.

4.

b.

Click Browse to locate the certificate file.

c.

Select the certificate format:•

PEM/DER – Base64/binary encoded certificate.

•

PKCS12 – Potentially holds multiple certificates, and private keys are ignored. Enter theappropriate password to import the certificate. When using a certificate chain, always include
any intermediate CA certificates in your import file. Only one file can be imported with thecertificate and any intermediate CA certificates.

Click the Default CA Certificates tab to import the Default CA Certificates package.
Before you can import the certificates, manually check for updates and then download the package fromthe TMC (Releases > ThreatDV > Default CA Package).

Configure an SSL trust store
Configure an SSL trust store to establish which certificates to trust in your profile's SSL client inspection
policy.
Before you begin
Import to the SMS your user-defined root CA certificates that you want to be trusted. In the SMS tools, click
select Admin > Certificate Management > CA Certificates and click Import.
Note
If the status of the import states that there is no trust anchor, click Refresh Status to ensure that the certificate you
imported shows as Valid in the Status column.

The trust store establishes how CA certificates are trusted. Only one SSL trust store can be configured per
policy. After a trust store is configured in SSL, it cannot be deleted.
Note
If the SMS manages a device that has an existing client trust store, the next profile distribution will overwrite thattrust store.

The only way a client knows it can trust a server CA certificate is based on whether the TPS sends the client atrusted signing certificate or an untrusted signing certificate.

10•

If the TPS sends a trusted signing certificate, the client must have the associated CA certificate in its trust
store (or, if the CA is self-signed, the trust store must have the signing certificate itself).

•

If the TPS sends an untrusted signing certificate, the client will be informed not to trust that CA
certificate.

SSL Inspection User Guide

Procedure1.

In the SMS tools, select Profiles > Shared Settings > SSL > Client > Proxy Trust Store.

2.

In the SSL Client Proxy Trust Stores workspace, click New.

3.

In the Create SSL Client Proxy Trust Store dialog, specify a unique name (required) and a description(optional) for the trust store.
Limit the name to 64 characters, which can include uppercase and lowercase letters, digits, underscores,
hyphens, and spaces. This name must be unique. Limit the description to 512 characters.

4.

Click Add to specify which of the user-defined root CA certificates that you imported at the beginning of
this topic you want your client policy to trust.
When the Include Default CA Certificates checkbox is selected, all the CA Certificates in the Default CA
Certificate package will be used. You can disable the checkbox and, optionally, add or remove other CA
certificates to the default list, but you cannot pick or choose individual CA certificates in the Default CA
Certificate package.

Add an SSL client proxy
An SSL proxy acts as an intermediary that performs SSL encryption and decryption between your client andthe SSL server. You must define an SSL client proxy before you configure an SSL policy.
For secure HTTP, IMAP, and POP3 traffic, create a separate SSL client proxy to enable DV filtering on thedecrypted SSL service. For example, if the traffic on TCP port 2000 is expected to be HTTPS, add an SSL client
proxy with a Detection Port of 2000 and a Decrypted Service of HTTPS to decrypt HTTPS.
For other SSL services, such as SMTPS, create an SSL client proxy with a Decrypted Service of Other. The TPS
device applies DV filters to the outgoing traffic, but does not apply them to the decrypted SSL service. In thecase of SMTPS, for example, any non-SMTPS filters in the DV would be applied to the outgoing decrypted
traffic, but any SMTPS-specific filters would not be applied to that decrypted traffic.
Procedure1.

In the SMS tools, click Profiles.

2.

Click Profiles > Shared Settings > SSL > Client > Proxies.

3.

In the SSL Client Proxies workspace, click New.

4.

In the Proxy Settings tab of the Create SSL Client Proxy dialog, specify the following settings:•

Name – Enter an SSL client proxy name that corresponds to the client traffic that you want todecrypt. The name is limited to 128 characters and may include uppercase and lowercase letters,
digits, underscores, dashes, and spaces.

•

Description – (Optional) Enter a description for the Client Proxy. Limit of 512 characters.

•

Signing certificate – From the list, select a signing certificate with a private key to decrypt the clientside SSL traffic, or click Import to find another signing certificate. One signing certificate must be
specified.

•

Decrypted Service – Select the SSL service that is accepted on the SSL Detection Port to enablefiltering for that particular service. If the SSL service you want is not listed, select Other.

•

Minimum key length – If you select this option, the TPS considers any certificate received during
SSL negotiation invalid if it has a key size that is lower than the minimum.
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Detection Ports – Specify which ports on the client proxy handle the SSL traffic. For example, if yourinternal clients accept HTTPS traffic on port 2000, specify 2000.
Note
If two SSL client policies within the same profile use the same port or port range for their proxies, thedevice will not be able to determine which policy to enforce. For example, if one client policy specifies aport range of 400–500 for its proxy, you cannot specify port 443 for the proxy of a second SSL client policyin the same profile.

•

Enable logging – Select this option to collect detailed log information about any SSL traffic that has
been decrypted to the external user disk (CFast or SSD). Use this option only for troubleshooting
purposes. For example, enable this option if, after you set up SSL inspection, the TPS device does not
see SSL session activity. By default, this option is disabled.

•

Send TCP reset to client for blocked sessions – Select this option to send a TCP reset to the client
whenever the TPS blocks an SSL session. This option overrides the TCP reset action set, if enabled,
on a DV filter.
Enable this option so that protected clients can release network resources on the client quickly ifflows are blocked. When this option is disabled, the TCP reset action, if enabled on a DV filter, still
applies.

5.

12

•

Block connections with invalid certificates – Select this option to block connections with an invalid
server certificate. A blocked message is returned in the SSL log. If this setting is disabled, theconnection succeeds and inspection begins. A warning message can result after the client attempts
to validate the spoofed certificate.

•

Block connections with expired certificates – Select this option to block connections with an
expired server certificate. A blocked message is returned in the SSL log. If this setting is disabled,
the connection succeeds and inspection begins. A warning message can result after the client
attempts to validate the spoofed certificate.

•

Downgrade HTTP2 protocols to HTTP1 – Select this option to downgrade HTTP/2 to HTTP/1.
Currently, only the HTTP1 protocol is supported for full inspection.

In the Cipher Suites tab, select which protocols and algorithms will be supported by your clients.

SSL Inspection User Guide

You must select at least one checkbox for each cipher suite criteria. The SSL Cipher Suites table
automatically updates based on you criteria selections. Deselect any cipher suites that you do not want.
You are now ready to add the SSL client proxy to an SSL inspection policy.

Configure a decryption policy
You can control which SSL traffic is decrypted—including domains, addresses, and server categories—and any
exceptions. The Default Client Decryption Policy includes domains that are recommended for use with SSL
client inspection to ensure connectivity to critical systems. You can modify the list according to therequirements of your specific environment. You can download updates to this list of recommended domains
from the TMC (Releases > ThreatDV).
Before you begin
Through category selections, you can exclude certain traffic, such as financial or healthcare traffic, to meet
regulatory and privacy requirements. If you make your selections by category, you must have a ThreatDV
subscription. You cannot use a pre-TOS v5.4 ThreatDV package on a device that has TOS v5.4 or later
installed.

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SSL Inspection User Guide

Procedure1.

In the SMS tools, select Profiles > Shared Settings > SSL > Client > Decryption Policies.

2.

In the SSL Client Decryption Policies workspace, click New,3.

In the Create SSL Client Decryption Policy dialog:•

Select the Name node and specify a name that corresponds to the client traffic applicable to thispolicy. You can optionally provide further elaboration in the Description field.

•

Select the Categories node and specify which of the sensitive categories should not be decrypted.
For a list of categories to be displayed, the SMS must subscribe to a ThreatDV URL Reputation feed
and have at least one managed device licensed to use those categories.
Note
If a profile has at least one category enabled and that profile is distributed to a device that is not licensed
for ThreatDV, the distribution status notifies you that the target device is not licensed for categories.

All categories are decrypted by default. After you make your category selections, you can list specificdomains within those categories that should be decrypted in the Category Overrides field. If a
Domain entry list is long, you can import them from a file. You also have the option to export alengthy exceptions list to an external file for easier management of the list.
14

SSL Inspection User Guide•

Select the Domains node to identify which specific domains are not to be decrypted. If a Domain
entry list is long, you can import them from a file. To include different subdomains of a primary
domain, you can use the *. wildcard. For example, specifying *.company.com will exclude thefollowing subdomains from decryption:•

finance.company.com•

mail.company.com•

legal.compliance.company.com

You also have the option to export a lengthy exceptions list to an external file for easier managementof the list.

Add an SSL client inspection policy
Configure an SSL client inspection policy to decrypt SSL traffic.
Before you begin
In order to create a client policy, you must first configure a client proxy. Learn more.
Procedure1.

In the SMS tools, click Profiles.

2.

Click Profiles > Inspection Profiles > profile_name > SSL Inspection Policies.

3.

In the Client Policies workspace, click New.

4.

In the Create SSL Client Inspection Policy dialog, select Locked to prevent an SMS user from changing
the SSL inspection policy directly, or as a child instance in another policy. When you select this option,
only users with the Lock SSL Filter capability can change the SSL inspection policy.

5.

Specify a unique policy name that corresponds to your SSL clients.
Important
The name you give your client inspection policy cannot match the name you give your server inspection
policy. The name must be unique across all SSL client inspection policies in the profile, as well as across any
child profiles.

6.

Under Settings, specify the following options:•

State: Select this option to enable and disable the SSL client policy. When you disable the inspection
policy, the SSL client proxy continues to decrypt existing SSL sessions.

•

Client proxy: Select the SSL client proxy to decrypt the SSL traffic.

•

Decryption Policy: Select an SSL client decryption policy from those you have previously
configured, or select <None> to not use a decryption policy.

•

Trust Store: Select which trust store to use from those you have previously configured. Select only
one SSL trust store for the policy.

7.

Under Never Decrypt, click Add to specify source IP addresses that should never be decrypted.

8.

Under Always Decrypt, click Add to specify source IP addresses that should always be decrypted.

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SSL Inspection User Guide

You are now ready to distribute your updated inspection profile with the SSL client inspection policy, or,
optionally, configure a decryption policy.

Configure SSL server inspection
Configure SSL server inspection to specify which SSL sessions you want the TPS device to inspect.
The TPS cannot effectively inspect the encrypted payload of SSL traffic that does not match the SSL inspection
profile.

Generate a certificate signing request for server SSL
A certificate signing request (CSR) is a certificate prototype that you generate using the SMS. It can be used toget an endpoint certificate for server SSL inspection. After you configure all the certificate options, youexport it to an established certificate authority (CA) who signs it. After it is signed, the CA sends you back thecertificate.
Your request can be for wildcard server certificates. These are certificates that have an asterisk-period (*.)
notation preceding the domain name. For example, *.domainname.com ensures that the certificate applies to
not just the domain but all its subdomains too, such as mail.domain.com. The wildcard must include boththe asterisk and the period together, in sequence, and cannot be placed anywhere other than the leftmost
position of the domain. Enter the wildcard domain in the Subject Alternative Name DNS (DNS Name) field of
the procedure that follows.
If your signing request includes a certificate with multiple domains, specify the additional domains in the
Subject Alternative Name DNS (DNS Name) field of the procedure that follows.
Procedure1.

In the SMS tools, select Admin > Certificate Management > Signing Requests.

2.

In the Signing Requests workspace, click New.

3.

In the New Signing Request dialog, enter values into the following required fields:•

Request Name – Name of the certificate you are creating.

•Common Name (CN) – The common name of the certificate, which is derived from the common
name of the server proxy to be protected by the certificate. For example, company.com,
www.company.com, or *.company.com.

You can also configure values for the following options:•

Key Size – Size, in bits, of the key. A minimum size of 2048 bits is recommended.

•

Make it a Signing Certificate – Not applicable. Select this option only for client SSL inspection.

•

Private key can be exported from SMS – If you intend to use the private key for other purposes,
select this option to enable the key to be exported from the SMS after the certificate is signed.

•

Email – Email address for the organization.

•
•

16

Organizational Unit (OU) – Division within the organization. For example, Research andDevelopment.

Organization – Legal, registered name of the organization. For example, National Football
League.

SSL Inspection User Guide•

Locality – City in which the organization is located or registered. Do not abbreviate. For example,

Saint Louis.

•

State – State or province in which the organization is operating. Indicate the state or province inwhich the protected server proxy is operating. Do not abbreviate. For example, Missouri.

•

Country – Two-character ISO format country code of the organization. For example, US.

•

DNS (DNS Name) – Additional domain name of the organization to be covered by the certificate. For
example, login.company.com.

•

User (RFC822 Name) – E-mail address of specific user in the protected server proxy's organization.
For example, susan@company.com.

What to do next
After you create the request, use the SMS to export the signing request without its private key to a certificate
authority who signs and issues the certificate. You will then import the signed certificate that the CA issues
you into the SMS as a non-CA certificate so that the private key from the signing request will also be
imported.

Import an SSL server certificate and private key
SSL inspection requires both the SSL certificate and private key from your server proxy of interest. ThroughServer Name Indication (SNI), the SMS accepts multiple certificates and keys from a single SSL server proxy.
This enables the server proxy to host multiple secure websites using the same IP address.
The SMS performs basic validation on the status of the certificates itself. If a certificate is not self-signed,
remember to import any intermediate CA and root CA certificates in the end-point certificate chain to Admin> Certificate Management > CA Certificates.
Important
Keep your certificates up-to-date. If you see a No Trust Anchor status, click Refresh Status to confirm thecertificate is valid. Whenever you update a certificate on your SSL server proxy, be sure to also replace thecertificate on the SMS. Learn more.

Procedure1.

In the SMS tools, click Admin.

2.

Click Certificate Management > Certificates.

3.

In the Certificates workspace, click Import.

4.

In the Import Certificate dialog, enter a certificate name that follows a naming convention so that you
can easily assign the correct certificate to the corresponding SSL server proxy.

5.

Click Browse to locate the certificate file.

6.

Select the certificate format, either Base64 Encoded Certificate (PEM) or Encrypted Private Key andCertificate (PKCS12).
Depending on the certificate format, consider the following points:•

PEM/DER format – Always import the private key in a separate file. Be sure to select the Include a
Private Key checkbox, and then browse to the private key file. If the private key is encrypted, always
enter the appropriate password in the Password box.
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SSL Inspection User Guide

Note
If this option is unchecked for a certificate that was created from a signing request generated from this
SMS, the private key will be retrieved automatically.
•

PKCS12 format – Enter the appropriate password to import the certificate/key pair. When using acertificate chain, always include any intermediate CA certificates in your import file. Only one filecan be imported with the certificate/private key pair and any intermediate CA certificates.
Note
If the certificates are not self-signed, be sure to also import any intermediate CA and root CA certificates in thecertificate chain to Admin > Certificate Management > CA Certificates.

7.

If you intend to use the private key for other purposes, select Private key can be exported from SMS sothat the key can be exported from the SMS.

You are now ready to add the SSL certificate to an SSL server proxy.

Add an SSL server proxy
Add an SSL server proxy to specify which SSL server configuration to proxy, including the SSL service that is
accepted on the SSL detection port.
If you upgrade to TOS v5.4 with an SSL server proxy already configured, the TLSv1.3 protocol and six new
cipher suites, including TLSv1.3-specific ciphers, will be automatically added.
For secure HTTP, IMAP, and POP3 traffic, create a separate SSL server proxy to enable DV filtering on thedecrypted SSL service. For example, if the web server accepts POP3S traffic on port 2000, add an SSL server
proxy with a Detection Port of 2000 and a Decrypted Service of POP3 to enable DV filters for POP3.
For other SSL services, such as SMTPS, create an SSL server proxy with a Decrypted Service of Other. The TPS
device applies DV filters to the incoming traffic, but does not apply them to the decrypted SSL service. In thecase of SMTPS, for example, any non-SMTPS filters in the DV would be applied to the incoming decrypted
traffic, but any SMTPS-specific filters would not be applied to that decrypted traffic.
To inspect more than one decrypted service on a particular SSL server proxy, define the same server IP foreach service you want. For example, you can define a server proxy with IP 1.1.1.1 and port 443 (HTTPS), andanother server proxy with IP 1.1.1.1 and port 995 (POP3S), and associate them with the same SSL inspection
profile.
Procedure

18

1.

In the SMS tools, click Profiles.

2.

Click Profiles > Shared Settings > SSL > Server Proxies.

3.

In the SSL Server Proxies workspace, click New.

4.

In the Create SSL Server Proxy dialog, specify the following settings under the SSL Server Proxy Configtab:•

Name: Enter an SSL server proxy name that corresponds to your Web server name so that you caneasily associate it with your web server.

•

Destinations: Specify the SSL server IPv4 address or CIDR range.

SSL Inspection User Guide•

Detection Ports: Specify the port range of the encrypted application traffic. For example, if your web
server accepts POP3S traffic on port 2000, specify 2000.

•

Decrypted Service: Choose the SSL service that is accepted on the SSL Detection Port to enablefiltering for that particular service. If the SSL service you want is not listed, choose Other.

•

Enable logging: Select this option to enable the TPS device to write log information about SSL
inspection to the external user disk (CFast or SSD). This option collects detailed logging informationand should only be enabled for troubleshooting purposes. For example, enable this option if, after
you set up SSL inspection, the TPS device does not see SSL session activity. By default, this option isdisabled.

•

Send TCP reset to server for blocked sessions: Select this option to always send a TCP reset to theserver proxy whenever the TPS blocks an SSL session. This option overrides the TCP reset action set,
if enabled, on a DV filter.
Enable this option so that protected server proxies can release network resources quickly if flows areblocked. When this option is disabled, the TCP reset action, if enabled on a DV filter, still applies.

5.

In the Certificates tab, specify the SSL certificates that, along with their private keys, decrypt incoming
traffic for your web server proxy. You can import a certificate now, or if you have already imported acertificate into the SMS certificate repository, select which ones you want.
For TOS v5.3 or later, you can select several system-wide certificates (up to 1000 per device) for a single
server profile. The SMS discards any duplicate certificates.
For any earlier TOS, you can select only one certificate; otherwise, the profile distribution will fail. Clickthe Repair button to re-import the private key of a certificate that has been identified as broken.

6.

In the Cipher Suites tab, select the protocols that are supported by your web server proxy.
The Cipher Suite list automatically updates based on your protocol selections. Deselect any cipher suites
that you do not want.

7.

Click OK. You are now ready to add the SSL server proxy to an SSL inspection policy.

Add an SSL server policy
Add an SSL server policy to your inspection profile to specify the server proxy traffic that you want to decrypt,
and any client exceptions. Always configure an SSL inspection policy for the inspection profile that is
assigned to the virtual segment that requires the SSL inspection.
Before you begin
In order to create a server policy, you must first configure a server proxy. Learn more.
Procedure1.

In the SMS tools, click Profiles > Inspection Profiles > profile_name > SSL Inspection Policies.

2.

In the Server Policies workspace, click New.

3.

In the Create SSL Server Inspection Policy dialog, select Locked to prevent an SMS user from changing
the SSL server policy directly, or as a child instance in another policy. When you select this option, only
users with the Lock SSL Filter capability can change the SSL server policy.

4.

Specify a unique policy name that corresponds to the SSL server proxy configuration.
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SSL Inspection User Guide

Important
The name you give your server proxy inspection policy cannot match the name you give your client inspection
policy.

5.

Under Settings, select the SSL server that you want this server policy to proxy.

6.

Under Source Exceptions, click Add to specify any SSL client IPv4 addresses to exclude from SSL
inspection.

You are now ready to distribute your updated inspection profile with the SSL server policy.

Configure HTTP1 protocol for server proxies
If you have the HTTP2 protocol configured for communication, you will have to downgrade the protocol to
HTTP1 in order to get full SSL inspection.
Before you begin
To switch to the HTTP1 protocol, you must use the device CLI. In order to use the device CLI, you must first
unmanage your device from the SMS. You can either unmanage your device using the SMS interface (Devices> All Devices, select the device that you want to unmanage, and select Edit > Unmanage Device > Unmanage)
or enter sms unmanage from the device CLI.
Procedure
1.

From the device CLI, enter the edit command so that you can make changes to the runningconfiguration:
tps_device{}edit

The command prompt changes to running.
2.

Enter the following commands to make changes to your SSL configuration:
tps_device{running}ssl-inspection
tps_device{running-sslinsp}server "<server_proxy_name>"
tps_device{running-sslinsp-server-<server_proxy_name>}http2-to-http1-downgrade enable
tps_device{running-sslinsp-server-<server_proxy_name>}exit
tps_device{running-sslinsp}exit
tps_device{running}commit
tps_device{running}exit
tps_device{}save

3.

Enter the sms manage command to have the SMS remanage your device:
tps_device{}sms manage

4.

To confirm that the HTTP2 protocol was successfully downgraded, display the current SSL configuration
by entering the display conf running ssl-inspection command:
tps_device{}display conf running ssl-inspection# SSL INSPECTION STATEMENTS
server-inspection enableclient-inspection disable

20

SSL Inspection User Guide# SSL SERVERS
server "<server_proxy_name>"
ip address 10.0.54.39/32
ip address 10.0.54.38/32
detection-port 443
decrypted-service httpprotocol TLSv1.0
protocol TLSv1.1
protocol TLSv1.2
protocol TLSv1.3
cipher-suite TLS_AES_128_GCM_SHA256
cipher-suite TLS_AES_256_GCM_SHA384
cipher-suite TLS_CHACHA20_POLY1305_SHA256
cipher-suite TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA
cipher-suite TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
cipher-suite TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
cipher-suite TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
cipher-suite TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
cipher-suite TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
cipher-suite TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
cipher-suite TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
cipher-suite TLS_RSA_WITH_3DES_EDE_CBC_SHA
cipher-suite TLS_RSA_WITH_AES_128_CBC_SHA
cipher-suite TLS_RSA_WITH_AES_128_CBC_SHA256
cipher-suite TLS_RSA_WITH_AES_256_CBC_SHA
cipher-suite TLS_RSA_WITH_AES_256_CBC_SHA256
certificate "server"
logging enabletcp-reset enable
http2-to-http1-downgrade enable
exit

Inspection profile distribution
Always distribute the inspection profile with your SSL inspection policy to the virtual segments that require
the SSL inspection and to the virtual segments that will receive the SSL client requests.
Important
You do not need to distribute an SSL inspection policy to the virtual segment that receives the SSL server response.
The SSL inspection policy enables the device to proxy (and decrypt) the SSL session between both the SSL client
and the device, and between the SSL server and the device.

When the inspection profile includes both an SSL server policy and an SSL client policy, and an SSL
connection matches both policies, the SSL server policy decrypts the SSL session.

Grant permissions to SSL inspection
Grant permissions so that an assigned user group can configure SSL inspection for particular SSL server
proxies and SSL client proxies.

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SSL Inspection User Guide

Add SSL inspection to the user role
Grant permission to a user role to configure SSL inspection, including:•

SSL inspection profiles•

SSL server proxies•

SSL client proxies•

SSL global settings•

SSL log•

SSL event information

By default, permissions for SSL inspection are granted to the Administrator role.
Procedure
1.

In SMS tools, click Admin.

2.

Click Authentication and Authorization > Roles.

3.

In the User Roles workspace, click New to create a user role based on an existing role or click Edit tochange an existing role. You cannot change the default user roles.

4.

In Capabilities options, configure the SSL Inspection Management inspection capability under Profiles> Shared settings management.

Grant the user group access to SSL configuration
Grant a user group permission to configure your SSL server proxies and client proxies. By default, a usergroup has access to all SSL server and client proxies, including new ones that have yet to be defined.
Procedure

22

1.

In the SMS tools, click Admin.

2.

Click Authentication and Authorization > Groups.

3.

In the User Groups workspace, click New to create a group or Edit to change an existing group.

4.

From the SSL Servers node, deselect an SSL server to deny access.

5.

From the SSL Client Proxies node, deselect an SSL client proxy to deny access.

6.

From the SSL Client Decryption Rules node, deselect a decryption rule to deny access.

7.

From the Profiles node, deselect an SSL inspection profile to deny access.

8.

From the Devices node, deselect a device to deny access.

SSL Inspection User Guide

Troubleshoot SSL inspection
If SSL clients cannot reach the server, check Traffic Management and Reputation filters to verify the sessionsof interest are not blocked. Traffic Management and Reputation filters are applied before SSL inspection.

View event information
Check the IPS Block and Alert logs, and the Quarantine log for event information about SSL traffic. These logs
include an SSL Inspect column to report on SSL sessions.
Only URL Reputation gets SSL inspected sessions reported in the Reputation Block and Alert logs. IP and DNS
Reputation do not report on SSL sessions because they are analyzed prior to SSL Inspection.
Note
If you see unexpected alerts on SSL traffic, the inspection profile might be inspecting the decrypted server
response. Learn more.

1.

In the SMS tools, click Devices.

2.

Click All Devices > device_name.

3.

Click Events > Traffic to view traffic graph for SSL traffic.
Traffic graph
SSL Decrypted Traffic

Information
Displays the overall SSL traffic seen and amount inspected.

View log information
The SSL Inspection log displays SSL session information, including information about SSL sessions that failed
to negotiate SSL parameters. By default, when you add an SSL server proxy or client proxy, logging is
disabled.
If you do not see SSL sessions for a particular server proxy or client proxy, edit the SSL proxy to enable
logging and then review this log for useful troubleshooting information. When you finish troubleshooting,disable logging on the proxy.
The SSL inspection log does not contain:•

SSL system errors – Check the System log for SSL-related system errors.

•

SSL sessions that are Blocked or Quarantined because of a filter match – Check the IPS Block and Alertlogs, and the Quarantine log. These logs include an SSL Inspect column to report on SSL sessions.

1.

In the SMS tools, click Events.

2.

Click SSL Inspection Logs.

3.

In the SSL Log Entries workspace, view and query the SSL Inspection log.

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SSL Inspection User Guide

Note
When you delete an SSL inspection profile or policy, the device continues to inspect the corresponding SSL
connections until the SSL connection closes, but the SSL inspection log incorrectly indicates that the SSL
connections have an unknown profile or policy. You can disregard these entries. The device stops logging theseconnections after the SSL connections close.

Basic troubleshooting
If SSL clients are reaching your server but the TPS device is not inspecting some or all of the encrypted
sessions of interest, check the following items:•

System log – Determine whether the TPS device is bypassing SSL sessions.

•

SSL server configuration – Verify the SSL server IP and ports.

•

SSL client configuration – Verify the SSL client port.

•

SSL inspection profile – Confirm any SSL inspection policies do not include a source IP exception thatwould bypass SSL inspection.

•

Virtual segment – consider the following:•

If the virtual segment designates a segment, confirm that it is the correct segment. For example,
confirm that interface 1A receives the SSL client request to your SSL server.

•If the virtual segment defines VLANs, confirm that the VLANs are correct for your SSL server.

•If the virtual segment defines source IP addresses, confirm that the SSL client requests correspondto those IP addresses.

•

If the virtual segment defines destination IP addresses, confirm that your SSL server corresponds toone of those addresses.
Do thisTo verify
The TPS is not bypassing SSL sessions

On the device, check the System log for an entry similar to thefollowing: SSL Inspection reached Critical thresholdof Max Concurrent Connections. Action: Allow but
bypass Inspection

If the number of concurrent SSL sessions exceeds the maximum
threshold as specified by the entry in the System log, the TPS
device does not inspect them. If necessary, reconfigure SSL
inspection to reduce the number of concurrent SSL connections.
For information about configuring SSL inspection to block SSL
sessions that exceed the maximum threshold, contact customer
support.

24

SSL inspection license is installed and valid

Verify the license package.

SSL inspection is enabled

Enable SSL inspection.

The correct certificate and key are installed

For SSL server inspection, import the SSL server certificate andprivate key.
For SSL client inspection, import the SSL signing certificate andprivate key.

The SSL server matches the correct IP address and port

Edit the SSL server.

The profile is applied to the correct virtual segments

Distribute the inspection profile.

SSL Inspection User Guide

To verify
The virtual segment includes the desired SSL server IP addresses
and ports

Do thisVerify the SSL clients are reaching the SSL server.

Advanced troubleshooting
If the basic troubleshooting does not resolve your issue, troubleshoot the TPS device.
Procedure1.

Run the debug np stats show npSslInspStats command to check the connection counters. If they
are all zero, then it is likely that you have a configuration issue. If there are refused connections, it is alsoa configuration issue, but there are likely incompatible ciphers or the connection is trying to use
compression when the profile does not support it. Learn more.

2.

Run the debug np stats show npSslInspProtocolStats command and consider these points:

3.

•

Non-zero entries in the clientCipherOther counter – Indicate a possibly unsupported cipher. Use
the other error counters to narrow the source of the problem to at least the server or the client.

•Server connection failures – Indicate a possibly unsupported cipher, but with the added chance thatthe server might be asking for a client certificate, which the proxy does not support.

Run the debug np stats show npTcpProxyStats command to confirm whether the profile and server
are configured to correctly match traffic. If the results are all zero, then there is no matching traffic toinspect. If there is any TCP traffic that matches a profile, the results are non-zero.

Replace an SSL server certificate
Replace an SSL certificate before it expires. If a certificate expires, the System log generates an error.
When you replace a certificate, consider these points:•

The SMS replaces the certificate on any applicable devices. Replacing the certificate preserves any
existing references to the certificate in the device configuration.

•

Changes to the device configuration, including certificate replacement, require you to have the Device
X509 Certification Configuration capability on the device.

•

Certificate replacement requires you to have the Admin X509 Certificate Management capability.
Important
When configuring SSL server inspection, make sure that you update both the device certificate and the SSL
webserver certificate before they expire. When configuring SSL client inspection, make sure that you update thesigning certificate before it expires. If the certificates expire or become out of sync, the SSL connections might fail.

Procedure1.

In the SMS tools, click Admin.

2.

Click Certificate Management > Certificates.
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SSL Inspection User Guide

3.

In the Certificates workspace, select a certificate from the list and click Replace.
•

For certificates with a private key, browse to and open a certificate.

•

For PEM/DER certificates, browse to and open the associated private key.

4.

(Optional) Provide a password to decrypt the private key.

5.

Click OK. The SMS appends _REPLACED to the name of the original certificate.
The SMS certificate repository automatically updates any managed devices with the new certificate. The
SMS displays an error message if the certificate replacement fails on a particular device.

26