Orchestrator Timeout Expired. The Timeout Period Elapsed Prior To Obtaining A Connection From The Pool

Error Fix for "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."

Error message in question means that application waited for a database connection but the timeout expired before it could get a connection, probably because the number of connection in the pool was too low for the number of connections that were attempted, or there was a network time out, i.e. the connection between IIS and your SQL Server was too slow to serve a connection.


Tweak the web.config as below - restart the website/IIS and let us know if that resolves the issue:

Section to be tweaked in web.config:

The parameter of interest in below line is 'Max pool size=200'

  • "server=localhost;database=mydb;uid=sa;pwd=mypw;Max Pool Size=200;"
If it does not help capture the SQL query time taken in the database using the SQL profiler. If above solution doesn't helps then share the details.