As all Microsoft security admins know, you have to be good at protocol analysis to find out what's happening on the wire. But what's the best protocol analyzer to use? There are plenty of commercial protocol analyzers you can use, but if you want to use a free one that provides commercial level functionality and flexibility, then it's hard to do better than Network Monitor 3.
To learn more about NM 3, check out the video Help links on the Network Monitor blog at:
Thomas W Shinder, M.D.
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MVP - Microsoft Firewalls (ISA)