This may have occurred because all pooled connections were in use and max pool size was reached.

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This may have occurred because all pooled connections were in use and max pool size was reached.
4/14/2015 12:07:23 PM

Error message:

The transaction cannot be started 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.

Tech
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Re: This may have occurred because all pooled connections were in use and max pool size was reached.
4/14/2015 12:10:15 PM

are you using SQL DataReader ?? if yes check are you closing the data reader.

This typically happens when connections are not closed after they are used.

I think you need to check how many open connections you have while the application is running.

You can use perfmon.exe to do this.Please refer to below link for more:

http://codebetter.com/blogs/peter.van.ooijen/archive/2005/11/04/134266.aspx

Ref:

http://forums.asp.net/t/1142193.aspx?This+may+have+occurred+because+all+pooled+connections+were+in+use+and+max+pool+size+was+reached+