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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi Greg,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Use your firewall to block outward
requests on port 1863, which is the default for Messenger.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>When Messenger finds that’s blocked,
it tries again on port 80.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>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.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Cheers,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Clarky<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>TSP Surrey Hills Subnetwork<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
tsi-bounces@edulists.com.au [mailto:tsi-bounces@edulists.com.au] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Greg Neil<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, 16 June 2005 11:07
AM<br>
<b><span style='font-weight:bold'>To:</span></b> tsi@edulists.com.au<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Tsi] Blocking messenger
use during class hours</span></font><span lang=EN-US><o:p></o:p></span></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Verdana><span style='font-size:9.0pt;
font-family:Verdana'>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.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Verdana><span style='font-size:9.0pt;
font-family:Verdana'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Verdana><span style='font-size:9.0pt;
font-family:Verdana'>Cheers,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Verdana><span style='font-size:9.0pt;
font-family:Verdana'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Verdana><span style='font-size:9.0pt;
font-family:Verdana'>Greg<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Verdana><span style='font-size:9.0pt;
font-family:Verdana'><o:p> </o:p></span></font></p>
<p class=MsoNormal><strong><b><font size=2 face=Verdana><span style='font-size:
10.0pt;font-family:Verdana'>Greg Neil</span></font></b></strong><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#313131" face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:#313131'>Computer Systems
Manager</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#313131" face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:#313131'>St Margaret's
School, Berwick</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>_______________________________________________ <br>
<a href="http://www.edulists.com.au">http://www.edulists.com.au </a>- FAQ,
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Information Technology Teachers Association Inc<o:p></o:p></span></font></p>
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