RE: Blocking Instant Messaging Applications

From: Aditya Deshmukh (aditya.deshmukh_at_online.gateway.strangled.net)
Date: 11/24/05

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    To: "'Alloishus BeauMains'" <all0i5hu5@gmail.com>, "'Neksus'" <neksus@gmail.com>
Date: Thu, 24 Nov 2005 08:03:42 +0530

    >
    > At the PIX or firewall, or wherever your ACLs are kept, block incoming
    > or outgoing traffic to oscar.aol.com, the messenger login servers,
    > trillian, yahoo, etc etc etc.
    >
    > You should be able to pull those from the connection logs. The clients
    > initiate contact with those authentication services, and if they can't
    > reach them, then they cannot logon and use them.
    >
    > Cleanest and easiest to me. If people cant logon to the service, then
    > you have rendered it useless.

    What about http proxies that can be used as a hop ?
    Most of the chat programs can use a HTTP proxy

    I think the best way would be to block packets contains
    the connect string as well

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