Feb 202008

If you want to block Yahoo and MSN Messengers in a firewall use the following procedure this is very helpful in corporate environments.

Port to block for Yahoo and MSN Messengers


TCP: 80, 5000-5050
UDP: 5000-5050


TCP: 1863,
UDP: 1503, 3389, 5004-65535

Try to block the IP address range for msn messanger

Blocking 207.68.*.*

Blocking 64.4.*.*

Yes, you’re blocking a lot of IP’s but a large percentage of them belong to microsoft ( hotmail,msn,msn messager…etc )

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