http://support.microsoft.com/kb/821268
You need to change in C:\WINDOWS\Microsoft.NET\Framework\V1.1.4322\CONFIG
Below are the recommendations from Micorsoft that we followed.
If you are making one Web service call to a single IP address from each ASPX page, Microsoft recommends that you use the following configuration settings:
Set the values of the maxWorkerThreads parameter and the maxIoThreads parameter to 100.
Set the value of the maxconnection parameter to 12*N (where N is the number of CPUs that you have).
Set the values of the minFreeThreads parameter to 88*N and the minLocalRequestFreeThreads parameter to76*N.
Set the value of minWorkerThreads to 50. Remember, minWorkerThreads is not in the configuration file by default. You must add it.
We have 2 CPUs so this is our configuration.
Do a find and you should be able to find the parameters mentioned above.
maxconnection="24"<br />
minFreeThreads="176" <br />
maxWorkerThreads="100"<br />
maxIoThreads="100"<br />
minWorkerThreads="50"

