AS400 Adapter Error

Hi Everyone,

Has anyone seen these two errors?
I am using wM version 6.0.1 AS400 Adapter version 1.0 (Description RPG/JDBC Connection )

“Adapter Runtime (Connection): The pool doesn’t have a connection available for the request.”

“RPGCall execution failed. Connection was dropped unexpectedly.”

I am processing the edi data batch-wise. I see this error while trying to call AS400 adapter service which is used to execute a command program in AS400. But when the service runs again for the next batch there will be a connection available and the adapter service will be executed.
Do you know why the pool does not have a connection available sometimes and why the connection is getting dropped unexpectedly?.
Here is the adapter connection management properties.
Enable Connection Pooling true
Minimum Pool Size 1
Maximum Pool Size 30
Pool Increment Size 1
Block Timeout (msec) 1000
Expire Timeout (msec) 1000


What should be the value for minimum pool size and minimum db connections? If the value is 1 and if there is a db conn failure, will that bad connecton object alive in the pool?