Re: What ports can be blocked to stop chat rooms and instant messaging?

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Ernest L. Williams Jr. wrote:

Hi

Which port does one block to stop all AIM and chat room related network
activity from going in or out?


I don't know which ports modern IM/chat software uses, but these will make for a good start:

[bevan@vyvyn ~]$ grep irc /etc/services
irc             194/tcp                         # Internet Relay Chat
irc             194/udp
ircs            994/tcp
ircs            994/udp
ircd            6667/tcp                        # Internet Relay Chat
ircd            6667/udp                        # Internet Relay Chat

Of course, if you can, it's easier and better to block all ports that you aren't actively using.




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