Re: MSN

From: Matt Gibson (mattg_at_blueedgetech.ca)
Date: 03/14/05 

Date: Mon, 14 Mar 2005 10:10:13 -0800

Bigbruva,

While that's a good article, this paragraph explains why blocking IM from
this at a port level is basically impossible.

Instant Messaging and Presence
In general, there are no issues with IM and presence affecting communication
through a firewall or NAT device. If the Windows XP client can create and
maintain a connection to the server, other IM and presence communication can
follow this same path. For example, Microsoft Exchange IM transports its
Presence and IM messages using hypertext transfer protocol (HTTP) and has
mechanisms to insure that these messages can traverse firewall and NAT
devices. These mechanisms include polling to maintain a TCP connection to
the server for two-way communication and setting aside a fixed port for
callback delivery.

Matt Gibson - GSEC

"Bigbruva" <Richardh@dontusethis.ws> wrote in message
news:%231AeZAMKFHA.3928@TK2MSFTNGP09.phx.gbl...
> If you are talking about "MSN Messenger" application, look at the
> following URL. This lists all the posts used by this application for
> sharing messages, files and applications.
> http://www.microsoft.com/technet/prodtechnol/winxppro/deploy/natfw.mspx
>
> Even though this page is for the Windows messenger the port numbers are
> the same for the features in the MSN version.
>
> Let us know if this is what you needed.
>
> BB
>
>
> "riki" <riki@discussions.microsoft.com> wrote in message
> news:A1A379C7-06E2-4EC7-9F91-2F15CF55649A@microsoft.com...
>> How to blok MSN which ports I need to block
>
>

Relevant Pages

  • Re: MSN
    ... If you wish to block MSN messenger from successfully connecting to the ... > this at a port level is basically impossible. ... > Instant Messaging and Presence ... > communication through a firewall or NAT device. ...
    (microsoft.public.security)
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