From: Dmitry Volkov (dmitry.volkov@rogers.com)
Date: Sat Jan 24 2004 - 18:23:45 GMT-3
Not so easy, some mess services like MSN may use HTTP for sign on when
default port is unavailable
Best - to block "sign on" url, nbar or url filtering - like websense will do
this work
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On
> Behalf Of Sarwat Siddiqui
> Sent: Friday, January 23, 2004 12:20 PM
> To: Jason Aarons; ccielab@groupstudy.com
> Subject: Re: How can I block Messenger services?
>
>
> I have tested it using ACL on edge routers and also with Checkpoint
> firewall. Work good. See the port number in the link below
> and block them
> using port number
> http://kbserver.netgear.com/kb_web_files/n100495.asp
>
>
> ----- Original Message -----
> From: "Jason Aarons" <jaarons@hotmail.com>
> To: <ccielab@groupstudy.com>
> Sent: Friday, January 23, 2004 11:50 AM
> Subject: RE: How can I block Messenger services?
>
>
> > Wouldn't that be expensive? How about IP Nbar ?
> >
> > >From: "Bezverkhi, Serguei" >Reply-To: "Bezverkhi, Serguei"
> >To: "Nir
> > Wittenberg" , >Subject: RE: How can I block Messenger
> services? >Date:
> > Fri, 23 Jan 2004 11:39:07 -0500 > >You could use Cisco Secure Agent
> > (CSA), it blocks these services >perfectly. > >HTH > >Serguei >
> > >-----Original Message----- >From: nobody@groupstudy.com
> > [mailto:nobody@groupstudy.com] On Behalf Of >Nir Wittenberg >Sent:
> > January 23, 2004 11:30 AM >To: ccielab@groupstudy.com
> >Subject: OT:How
> > can I block Messenger services? > >What are the options to
> block such
> > services as Instant Messenger, Yahoo >Messenger, and AOL
> Messenger? I
> > have searched and it does not seem that >this could be done
> strictly with
> > a PIX. > >Any advice is appreciated, >Nir >
> >
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