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Killing the Messengers

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by joe donahue

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Does anyone out there know how to block out the ability to use the following instant message programs Yahoo, MSN, AOL. We're behind a Watchguard firewall. So far all that I could block out was AOL Instant Messenger and that was accomplished by blocking port 5190

5 replies

by jcrawford

MSN can be blocked by blocking tcp ports 1863 and tcp ports 6891-6900 used for file transfers.

Yahoo port 5050 you will have more trouble. Yahoo gives the option of (Firewall with no proxies connection)

The firewall with no proxies setting allows you to connect to our servers using only http requests.

Yahoo's Messenger servers are cs1.yahoo.com, cs2.yahoo.com, and cs3.yahoo.com.
You can block access to these servers.

by stockbl

I don't have a solution for this, but I will let you know that blocking the AIM port doesn't work if your users are smart. It is very easy to change the port in AIM. We tried blocking AIM at my college because of file transfers, but users figured out that if they changed the port, it nulled the block. Just FYI.

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