500 Internal error - Timeout expired

Question

I am getting "500 Internal Server" error while accessing my webapplication in SharePoint 2010. After some tracing I found that the actual error is :

"Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached"

After I perform IIS Reset everything works fine but only for few minutes. I have already tried following: increase the executionTimeout in web.config to 3600

• edit all custom code to have dispose

• change the Idle Time-out in IIS

• Change the timeout value to 90 in SharePoint configuration DB connection string

This error has recently occurred, can any one suggest what possibly could be done here.

Answer 1

As you said, if perform IIS reset then it work fine for couple of min/hour then goes down. this make sense as 98% usage of memory of 32 GB is alot, Couple of things to check.

• why Memory usage is too high, How many App pool running on the server.
• Try to stop unused App Pool and Unwanted services from SharePoint
• If you have customization on your site then make sure no memory leaks in it.
• check the Search service, if that is consuming all resources.
• check the App Pool connection setting.
• Check the Logs for more clue.

.