![]() If you block port 139 on a Domain Controller you will kill AD replication. Port 139: Is typically used for file/printer sharing, including directory replication with Active Directory, trusts, remote access of event logs, etc. Due to the popularity of this port for malicious exploitation, it should never be open unless it is being actively and deliberately used to serve web pages. This port will generally be open only when a web server of some sort is running on the machine. Port 80: This is the primary port used by the World Wide Web (Similarly, when a web browser is given a remote address (like grc.com or ), it assumes that a remote web server will be listening for connections on port 80 at that location. Because of the potential threat our host computers sending spam email Port 25 will remain closed. ![]() Port 25 can get clogged with spam e-mails when computers on a network become infected with a virus or other malicious software. Port 25: Is the virtual pathway that most e-mail traffic follows when it travels from your computer to a server.
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