Io exception: Connection refused

Question

I have a main process flow that incorporates a number of sub-process flows to perform a complete warehouse load. Whenever I execute this process flow, it fails with the error shown below. It fails at a different subprocess each time I run it, and when I execute just that subprocess by itself, the subprocess completes successfully. I have no idea what causes this error or how to prevent it from re-occuring:
RPE-02083: Process ITM_LOAD has errored Activities. Dependent objects may not have been deployed. You can use Oracle Workflow Monitor to retry the activities or abort the Process.
RPE-02018: Oracle Workflow schema OWF_MGR on host <hostname> cannot be accessed using service <database name> through port 1521. Please check the location details and try again.
Io exception: Connection refused(DESCRIPTION=(TMP=)(VSNNUM=153092352)(ERR=12516)(ERROR_STACK=(ERROR=(CODE=12516)(EMFI=4))))
I would really appreciate any help on this!!

Answer 1

Julie,
Can you check the location registration for all locations? It looks like you hit TNS-12516:
TNS-12516 TNS:listener could not find available handler with matching protocol stack
Cause: None of the known and available service handlers for the given SERVICE_NAME support the client's protocol stack: transport, session, and presentation protocols.
Action: Check to make sure that the service handlers (for example, dispatchers) for the given SERVICE_NAME are registered with the listener, are accepting connections, and that they are properly configured to support the desired protocols.
Mark.