Blocking MSN and other IM clients in corporate firewalls

Blocking MSN and other IM clients in corporate firewalls
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Subject Author Date
Blocking MSN and other IM clients in corporate firewalls Jarle Aase 02-16-2005
Posted by Jarle Aase on February 16, 2005, 6:35 am
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Hi,

Does anyone have a good solution on this issue? I have a couple of companies
who wants to block IM totally on the firewall. Since some IM applications
(like MSN messenger) is designed to bypass simple port-range blocks, I'm
looking for another solution; possibly something like a list of blacklisted
IP numbers that the firewall can update from time to time from a central
server. The firewalls in question use Linux and netfilter.

Jarle
--
Jarle Aase http://www.jgaa.com
mailto:jgaa@jgaa.com

<<< no need to argue - just kill'em all! >>>


Posted by Systemguy on February 16, 2005, 8:59 am
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Hello All,


To block access to the .Net Messenger service or MSN Web Messenger:
1. Block outbound access to TCP port 1863.
2. Block HTTP access to messenger.hotmail.com.

If you would like to block access to MSN Web Messenger you will also
need to block HTTP access to webmessenger.msn.com.

From http://support.microsoft.com/kb/889829

Cheers,

Systemguy

> Hi,
>
> Does anyone have a good solution on this issue? I have a couple of
> companies
> who wants to block IM totally on the firewall. Since some IM applications
> (like MSN messenger) is designed to bypass simple port-range blocks, I'm
> looking for another solution; possibly something like a list of
> blacklisted
> IP numbers that the firewall can update from time to time from a central
> server. The firewalls in question use Linux and netfilter.
>
> Jarle
> --
> Jarle Aase http://www.jgaa.com
> mailto:jgaa@jgaa.com
>
> <<< no need to argue - just kill'em all! >>>




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