The Server service is necessary for NetBIOS functionality, and when that service is not running, NetBIOS is not available. Web server or many other servers you might expose to the Internet. The only limitation in stopping the Server service is that you can no longer access that machine's resources using NetBIOS-based tools such as NT Explorer or User Manager. Create and assign a blocker rule to this filter. TCP ports 139 and 445 will not respond to a port scan.
Filters are granular per protocol, and source and destination ports and addresses.
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