Re: MSN

From: Bigbruva (Richardh_at_dontusethis.ws)
Date: 03/14/05 

Date: Mon, 14 Mar 2005 12:40:31 -0800

Okay Matt so perhaps I was being a little lazy in posting the link instead
of posting an answer...busted!

If you wish to block MSN messenger from successfully connecting to the
messenger service do the following on your network firewall:

1) Block outbound access to TCP port 1863
2) Block HTTP access to messenger.hotmail.com

This will stop the initial access to the service and therefore block the
application and all it's other communications.

HTH

BB

"Matt Gibson" <mattg@blueedgetech.ca> wrote in message
news:OQrwyEMKFHA.2764@tk2msftngp13.phx.gbl...
> 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
>>
>>
>
>

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