Troubleshooting IIS Performance Issues or Application Errors using LogParser
This article has been moved to its new home here: https://benperk.github.io/msdn/2013/2013-01-troubleshooting-iis-performance-issues-or-application-errors-using-logparser.html
If you haven't already visited the troubleshooters section of the IIS.NET website, take a look at it here. You will find a number of good troubleshooting guides.
I contributed an article that discusses using LogParser to troubleshoot performance or application issues/errors. I hope you find it useful.