How to block IM using ISA 2004?

I would recommend going to the manufacture support sites for the following
products, and read through their firewall docs on what ports to "Allow"
through firewalls for access to their services, and then create a "deny
rule" above your default "allow rule" which prevents these ports.

If I recall:
AOL: 5001-5010
Yahoo: 80 (they tunnel on 80, so you may need to create a separate rule to
block 80 to *.imserver.yahoo.com)
MSN: same as above
Google: (it's new, but same as above)

If you were me, however, I block all web-traffic, unless explicitely
allowed. As in it's alot easier to allow access, based upon the
needs/requirements presented by my user community, than it is to try to
target what to block one by one.



"Sahara" wrote in message

>I have a SBS 2003 SP1/ISA 2004, I want to block MSN,AOL,Yahoo IM, can
>anyone
> provide me some step by step instructions?
> TIA!
>
> Sahara