[Tsi] Blocking messenger use during class hours

[Clark, Ian C]

Hi Greg,

 

Use your firewall to block outward requests on port 1863, which is the
default for Messenger.

 

When Messenger finds that's blocked, it tries again on port 80.

 

Since you don't want to block that one (you need it for http access),
just block the domains it makes contact with:  messenger.hotmail.com and
webmessenger.msn.com.

 

Cheers,

Clarky

TSP Surrey Hills Subnetwork

 

________________________________

From: tsi-bounces at edulists.com.au [mailto:tsi-bounces at edulists.com.au]
On Behalf Of Greg Neil
Sent: Thursday, 16 June 2005 11:07 AM
To: tsi at edulists.com.au
Subject: [Tsi] Blocking messenger use during class hours

 

We are a predominantly XP environment with Win2k3 servers. Main
firewalls are SonicWall and ISA2004. We have been unable to successfully
block messenger access via the firewalls. The main culprits are MSN
Messenger and Windows Messenger. We have been able to successfully stop
them being accessed via group policy, however this blocks them when they
are off our network, which is (apparently) unacceptable. Anyone who has
been successful in nailing messenger programs during class hours, we'd
appreciate a new approach.

 

Cheers,

 

Greg

 

Greg Neil

Computer Systems Manager

St Margaret's School, Berwick

 

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