Just got reminded about a very nice ISA Firewall blog that I've known about for some time, but for some reason got lost in the pile on my desk. Adrian Dimcev runs a great site over at http://www.carbonwind.net/
Adrian gets down on the log files and packet traces, so if you want to hone your skills in these areas, you'll greatly benefit by setting aside a few hours to read Adrian's insightful analyses.
Thomas W Shinder, M.D.
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MVP — Microsoft Firewalls (ISA)