If you’re interested in the details of how the Network Inspection System (NIS) on the TMG firewall works, and you like lots of screenshots and examples of how to trigger the NIS, then you have to check this article by Adrian Dimcev:
In this article, Adrian drills down in the details of NIS, and how you can use various tools to test the NIS as it blocks various protocol anomalies and system vulnerabilities.
This is a highly recommended read for anyone who is thinking about upgrading their ISA firewall to the more powerful and secure TMG firewall.
DEBRA LITTLEJOHN SHINDER
MVP (Enterprise Security)