Then check the maxWorkerThreads & minFreeThreads settings for your .NET Framework config.
Improving ASP.NET Performancehttp://msdn.microsoft.com/en-us/library/ms998549.aspx
Why ‘maxWorkerThreads’ = 100 and ‘minFreeThreads’ = 88 is suggested?http://forums.asp.net/t/1299590.aspx
Planning, testing and tuning for ASP.NET and IIS 6.0http://www.codeproject.com/KB/aspnet/ASPNET_and_IIS_60.aspx?display=PrintAll&fid=127812&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=1069214
Tune the thread pool by using the formula to reduce contentionhttp://channel9.msdn.com/wiki/guidancelibrary/tunethreadpool/
Reduce Server Too Busy errors with the httpRuntime taghttp://www.devx.com/vb2themax/Tip/18804
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