This is always in interesting area of conversation.
Check out Mike Bazarewsky’s answer to the problem at:
Also, check out Microsoft’s solution:
http://support.microsoft.com/kb/556039/en-us
(which interestingly enough, it also done by Mike!)
HTH,
Tom
Thomas W Shinder, M.D.
Site: http://www.isaserver.org/
Blog: http://blogs.isaserver.org/shinder/
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MVP — Microsoft Firewalls (ISA)