Block file transfer in Windows Messenger

Posted on 2009-04-22
Last Modified: 2012-05-06
I am looking for a way to prevent MSN Messenger, Microsoft Messenger or Live Messenger from performing file transfers throughout our organization. I'd like to be able to use a GPO to disable the file transfer function if possible. Does anyone know of a way to do so with all version of Microsoft Messenger products? We want to allow people to continue to use Messenger for communication to outside vendors but for security reasons I don't not want anyone to be able to send or receive files using Messenger.
Question by:mklippel
    LVL 3

    Accepted Solution

    Blocking ports 6891 to 6900... should do this for you.

    Author Comment

    I have that in place on my firewall and will have it tested tomorrow. I was looking for a GPO solution which seems the better all round solution for this. You'd think Microsoft would enable their products to be controlled better.
    LVL 3

    Expert Comment

    Do you only allow the MS versions or can you keep them fomr using google talk and yahoo type IM services?

    Author Comment

    I can block all IM versions and plan on only allowing the Microsoft products. I know this is going to be tough since a lot of the IM programs out there can use port 80 for their traffic.
    LVL 2

    Expert Comment

    i had the same problem that i need to prevent some users from using IMs and file transfer over IM and allow some user to use IM such as sales and i ended to use web-filter software like web-sense express if the users count less than 100 user i used it and achieve exactly what I need, specially there is a lot of  IMs uses port 80 to connect to internet or uses dynamic ports which hard to control and block

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