How can I block MSN Messenger through Sonicwall Firewall

I have created two access rules on Sonicwall firewall that blocks MSN TCP port 1863 and MSN UDP port 1863, Source: LAN Target: WAN, but it is not blocking users to logon to MSN Messenger. Do anybody have any idea..
anas_elkhaniAsked:
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devangshroffCommented:
enable IPS IDS on sonixwall
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cadnycCommented:
can anyone please walk me thru the IPS setup on the sonicwall?? thanks in advance
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