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Blocking MSN Messenger?

Posted by Cliff on from the making-IMs-not-so-instant dept.

Tekno2k3 asks: "As a sysadmin for a financial company, I have been tasked with removing Instant Messaging from our network. The only service that is being difficult is MSN Messenger. It uses many methods to get around being blocked. These include using port 80, using it's own DNS servers for lookup, using MANY logon servers, and using reverse DNS lookup. Has anyone had any success in blocking Messenger?"

2 of 236 comments (clear)

  1. Something at the protocol level? by dimator · · Score: 0, Redundant

    I'm sure something is known about the messenger protocol... Find it, and find out how the authentication is done. Now, the problem just becomes listening in on new connections, and determining if its a messenger client authenticating itself. If it is, you could kill the connection.

    I don't know the tools that do any of that, though, but I'm sure they exist. :)

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    python -c "x='python -c %sx=%s; print x%%(chr(34),repr(x),chr(34))%s'; print x%(chr(34),repr(x),chr(34))"
  2. jsut test it out by nocomment · · Score: 0, Redundant

    install msn messenger...and run it. See how it connects and then block that method, then re-run messenger and see how it connects and block that. wash lather rinse repeat until messenger can no longer connect.

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    /* oops I accidentally made a comment, sorry */
    /* http://allyourbasearebelongto.us */