Microsoft has released the Internet Security and Acceleration (ISA) Server Best Practices Analyzer Tool. You can download it from Microsoft. This tool performs a full check of the ISA Server installation and makes recommendations about steps to take. After you run a "Start a new Best Practices scan," you can view a report of the problems that need to be resolved, as shown here.
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When you select any of the problem areas, the tool presents information about how to resolve the problem