[fw-wiz] SOCK5 Proxy and MSN 6.2 IM

From: Ravi Kumar (ravivsn_at_rocsys.com)
Date: 07/30/04

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    To: firewall-wizards@honor.icsalabs.com, firewalls@securityfocus.com
Date: Fri, 30 Jul 2004 10:57:54 +0530

    Hi,
       I observed that SOCK5 client support is built in most of
       IM clients such as MSN IM, AOL IM, ICQ etc..

       As I understand SOCK5 is used for authenticated firewall
       traversal and also to open holes in firewall to receiving incoming
       connections and any new outgoing connections.

       I have installed SOCK5 proxy server on my firewall and tried to
       see if MSN IM works without any ALG (Application specific
       intelligence). Normal chat works through SOCKS5 proxy, but
       the file transfer, Audio/Video conversation does not go through.
       It seems that MSN IM Client, rather than going making connections
       through the SOCKS5 proxy server, is making connections directly.

       Does anybody have any observations on whether MSN 6.2 IM support
       of SOCK5 for file transfer/audio/video connections? Is there any thing
       I am missing in my configuration of MSN IM client?

    Thanks in advance
    Ravi

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