How to block...
Hello
I already block http/s, ftp, but how to block any program like msn messenger, yahoo, Skype oeven chat...
Thank you
Tonny
Tonny, I feel your pain,
To my knowledge the only way to block the IM is actually closing the ports on which they ride. I have them listed below. However, although port 80 is not the main port for Yahoo, Yahoo Instant Messaging will search for 80 to use, if it does not find it's own default port. Skype itself uses port 80 and port 443 by default. Thus, it will be harder for you. I don't know that Skype will become lethargic and error, of course causing end user enough frustration that they cannot use it at all.
Also, know (and you can already) a program called Trillian combines the features of the three principals of the IM, I'm not sure of the ports that use Trillian, but you should be able to find out.
Anyway I hope this helps.
AOL Instant Messenger
o 5190 (TCP-out)
o login.oscar.aol.com
· Microsoft .NET Messenger
o 1863 (TCP-out)
§ o 5060 for Session Initiation Protocol (SIP) (TCP)
o 1503 for Audio/video, file sharing and whiteboard (TCP).
o 6891 to 6900 for File Transfer (TCP).
o 3389 for Assistance (TCP) remotely.
· Yahoo! Messenger
o 5050 (TCP-out)
o 5101 (inbound TCP)
o 5100 for webcam (TCP)
o 5001 for voice (TCP)
o for the voice: cs1.yahoo.com, cs2.yahoo.com, and cs3.yahoo.com
o Yahoo will find ports 5050, 80, 20, 21, 25, 37 and 119 if 5050 is blocked
Tags: Cisco Security
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