Web server Administrators have been using the Debug Diagnostic 1.1 to troubleshoot crash\hang issues on IIS 5 and 6. The Debug Diagnostic tool needs no introduction. It is a great tool and it provides you a lot of flexibility in collecting crash dumps
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Read the complete post at http://blogs.iis.net/webtopics/archive/2009/11/25/how-to-collect-a-crash-dump-of-an-iis-worker-process-on-iis-7-0-and-above.aspx