Problem with IHttpAsyncHandler and ASP.NET “Requests Executing” counter

Question

Solved:

I found the solution to this. Not sure why it happens but Switching the application pool type to \'classic\' from \'integrated\' solves the

Answer 1

Here is a blog post that explains what you are seeing:

http://blogs.msdn.com/b/tmarq/archive/2007/07/21/asp-net-thread-usage-on-iis-7-0-and-6-0.aspx

and companion post

http://blogs.msdn.com/b/tmarq/archive/2010/04/14/performing-asynchronous-work-or-tasks-in-asp-net-applications.aspx

In integrated pipeline mode, using the default configuration, IIS7 places a limit of 12 concurrent REQUESTS (not threads) per CPU. You can change this by modifying the configuration.

I couldn't let it go. I'm pretty sure this is what you're seeing. Deep diving into the article, I don't really like the change they made because it clearly causes problems like this, but who am I to judge!