The only luck I have had blocking most of these engines is to block the actual server addresses that the messenger is trying to connect to. This is very time consuming (took me about 10 hours total to block AIM, MSN and Yahoo) and even then they put new servers up and it requires constant...
pmandra, are you wanting to open these ports to all orare you planning on locking it down? In my environment, we permit PCAnywhere through the PIX, but only from specified hosts to specified hosts, for security reasons.
Let me know which way you plan and I can post some config info for you
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