[thelist] [OT]How to block Yahoo Messengers on the Intranet

Hello Everyone,

Can someone guide me on how do i block Yahoo Messengers, in the Intranet,
Lab. I have a Win2k server & also a Linux Server [with Squid & IP Chains] as
the gateway.

I found this on Google for AOL & ICQ and MSN.
#AOL Instant Messenger
       ipchains -A input -s 0/0 -d 0/0 5190 -p tcp -j DENY
       ipchains -A input -s 0/0 -d 0/0 5190 -p udp -j DENY
#ICQ
       ipchains -A input -s 0/0 -d 0/0 4000 -p tcp -j DENY
       ipchains -A input -s 0/0 -d 0/0 4000 -p udp -j DENY
#Microsoft Instant Messenger
       ipchains -A input -s 0/0 -d 0/0 1863 -p tcp -j DENY
       ipchains -A input -s 0/0 -d 0/0 1863 -p udp -j DENY

Please guide me about how to make COMPLETE block to Yahoo Messenger.
Any pointers will be helpful.


Thanks in Advance.

Navin Dhanuka
Student, MSc CA
Symbiosis Institute Of
Computer Studies and Research