Jonathan, a Solidsoft colleague, just sent
around a link to AuthDiag ..
more here:
AuthDiag 1.0
offers a robust tool that offers a efficient method for troubleshooting authentication
on IIS 5.x and 6.0. It will analyze metabase configuration and system-wide policies
and warn users of possible points of failure and guide them to resolving the problem.
AuthDiag 1.0 also includes a robust monitoring tool called AuthMon designed at capturing
a snapshot of the problem while it occurs in real-time. AuthMon is robust and specially
designed for IIS servers removing any information not pertinent to the authentication
or authorization process.
Excellent stuff!