How can I block only Yahoo Messenger with ISA server?

Joel Johnson
Published: 29 Jul 2003

How can I block only Yahoo Messenger with ISA server?
Yahoo uses http. You will need to block access to their servers. Here is the current list from yahoo:

Protocol: TCP or HTTP

Servers:
scs.msg.yahoo.com
scsa.msg.yahoo.com
scsb.msg.yahoo.com
scsc.msg.yahoo.com

Port: 20,23,25,80,119,5050,8001,8002

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