Timeout error - MySQL

{"error connecting: 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 Code:  -2147467259   (is there a list of error codes and troubleshooting error codes, somewhere?)

Here is the connection string:

<add name="leadcollatordb" connectionString="server=10.1.1.160; uid=root; pwd='<<hidden>>'; database=leadcollator_dbo; default command timeout=28000;"/>