How to block yahoo messenger

Dear friends,

Hi

I really need a help to block yahoo chat in ISA 2004. I've googled and tried
many instructions but still no success. Firewall clients still get connected
to the messenger. Does anybody have a tested step by step guide to make me
get around?

Regards,
Ehsan Mafi,
CCNP (BCMSN), CCNA, MCP


.

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