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Blocking IM Chats on Firewall devices

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Article ID: KB7827 KB Last Updated: 23 Aug 2011Version: 7.0
Summary:
How to block AIM, Yahoo, MSN Messenger, MS Windows Live Messenger, Skype, and other chat applications.
Symptoms:
AIM, Yahoo, Windows Live Messenger, MSN Messenger, Skype and other chat application vendors use their own application port numbers, but will also try going out port 80, if their own application port is not open.  This makes it tough to block IM, since port 80 is the same port number as HTTP.
Solution:
Chat vendors use P2P technology, which is similar to Bit Torrent, Kazaa, and Napster. In order to block Chat applications via Deep Inspection, you will need to use a Juniper  IDP device to block those signatures. Deep Inspection on the firewall device does not support blocking of Chat signatures.
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