First, you will have to shut down your server. From a Notes client installed on a workstation, map a drive to the server and open the files locally to change the ACLs. This is well worth the down time to correct. Access to any of these files by unauthorized users can provide very detailed information about your Domino server and give them a roadmap into your infrastructure. TCP Ports used by Domino.
Domino offers full internet standards support for all the main protocols and services.
Domino also has full SSL support on all the protocols above. As with any server that is on the public internet or a private intranet, only run the services that you actually need. Security Settings on the Server Configuration Document. Most of the configuration settings on a Domino server are stored in the server document in the Public Address Book on the server. This concludes my paper on the basics of locking down a Lotus Domino server.