[FW1] How to block MSN Messenger

[Prayut Suwanvisat <sprayut@FW1-NOSPAMyahoo.com>]

Dear all,

I understand that MSN Messsenger using TCP Port 1863
to connect to server.  I try to block this service  by
following

Internal net -> Any -> TCP Port 1863 -> Drop

After apply this rulebase my user still can access MSN
Messenger Server.    

Any Advise ?  Thanks a lot

Prayut S.
Asstant Network Engineer.

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