MSN changes the ports dynamically. The access-list command can block the traffic to all the IP addresses and port numbers on which MSN works, in order to block all the connections to that site. The access-list command blocks the connections to the MSN site from the inside to the outside through the PIX Firewall.
In order to block access to MSN messenger (instant messaging), try these commands:
access-list block-msn deny tcp any any eq 1863
access-list block-msn deny tcp any host 188.8.131.52 eq www
access-list block-msn deny tcp any host 184.108.40.206 eq www
access-list block-msn deny tcp any host 220.127.116.11 eq www
access-list block-msn deny tcp any host 18.104.22.168 eq www
access-list block-msn deny tcp any host 22.214.171.124 eq www
access-list block-msn deny tcp any host 126.96.36.199 eq www
access-list block-msn permit ip any any
access-group block-msn in interface inside
Note: The IP addresses given are those of the MSN messenger servers IP addresses on port TCP 80.
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