Are there any error messages or return codes to explain the problem?

You might find error messages or return codes that help you to determine the location and cause of your problem.

IBM® MQ uses error logs to capture messages concerning its own operation, any queue managers that you start, and error data coming from the channels that are in use. Check the error logs to see if any messages have been recorded that are associated with your problem.

IBM MQ also logs errors in the Windows Application Event Log. On Windows, check if the Windows Application Event Log shows any IBM MQ errors. To open the log, from the Computer Management panel, expand Event Viewer and select Application.

For information about the locations and contents of the error logs, see Error logs on Windows, UNIX and Linux systems

For each IBM MQ Message Queue Interface (MQI) and IBM MQ Administration Interface (MQAI) call, a completion code and a reason code are returned by the queue manager or by an exit routine, to indicate the success or failure of the call. If your application gets a return code indicating that a Message Queue Interface (MQI) call has failed, check the reason code to find out more about the problem.

For a list of reason codes, see API completion and reason codes.

Detailed information on return codes is contained within the description of each MQI call.