Re: Blocking Instant Messaging Programs
- From: "Bobby Mir" <bam@xxxxxxxxxxxxxxx>
- Date: Fri, 10 Jun 2005 12:07:29 -0400
Hi Ray,
That's a great idea...you wouldn't happen to know the authentication for
Yahoo and ICQ, or where I could get this info, since you covered MSN and
AOL. It'd be much appreciated.
Thanks,
Bobby
"Ray" <replyhere@xxxxxxxxxxxxxx> wrote in message
news:%23SWORKTbFHA.3196@xxxxxxxxxxxxxxxxxxxxxxx
> One really, really easy way is to block their authentication lookups. For
> instance, MSN Messenger uses
>
> messenger.hotmail.com
>
> so I placed entries in the HOSTS file on ISA 2000 of
>
> 172.16.0.3 messenger.hotmail.com
> 172.16.0.3 my.screenname.aol.com
> 172.16.0.3 login.oscar.aol.com
> 172.16.0.3 my.gmy.screenname.com
>
> and waited the requisite eight hours for the ISA DNS cache to clear and no
> more Messenger, etc! Remember, when ISA is used as the web proxy, it
> performs all DNS lookups on behalf of the client.
>
> Just don't point the HOSTS file to 127.0.0.1 . I did that initially and
> every Messenger session brought up a "log on to proxy" prompt because ISA
> was treating it as a local logon.
>
> Ray
>
> "Bobby Mir" <bam@xxxxxxxxxxxxxxx> wrote in message
> news:%23%23nvpdEbFHA.3040@xxxxxxxxxxxxxxxxxxxxxxx
> > Hi there,
> >
> > I am trying to block the use of AOL Instant Messenger, MSN Messenger,
> Yahoo
> > Messenger, and ICQ (the top 4 used instant messaging clients used on our
> > network). We've got an ISA 2000 Server set up. I am interested in
> knowing
> > how blocking these can be done on the server side, i.e. not having
> anything
> > to do with client machines. Blocking the web based versions of these is
> not
> > so hard, as that can be implemented in the restricted
destinations...same
> > thing applies to web based email (Hotmail, Yahoo, AOL, Gmail, etc). We
> are
> > not interested in using the ISA Firewall as that has to be used on
client
> > machines as well. Is there any other way this can be done such as
> blocking
> > relevant ports? Does anyone know these ports or port ranges or where I
> can
> > go to have this done? Any help and recommendations would be
apprecaited.
> >
> > Thanks in advance,
> >
> > Bobby
> >
> >
>
>
.
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- Blocking Instant Messaging Programs
- From: Bobby Mir
- Re: Blocking Instant Messaging Programs
- From: Ray
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