Diagnosis
Endless queues, which are not executed in normal production operation,are contained in the SAPconnect function modules or classes forreceiving incoming message using SMTP or RFC.
Entering the OK code =DBG+ in transaction SCOT activatesthese queues.

System Response
All incoming messages using SAPconnect cause the program flow to hangin one of these queues. If the queue is not exited by manualintervention using the ABAP debugger, the ABAP process terminates witha dump after a certain amount of time.
Automatic processing of incoming messages is not possible in thesecircumstances.

Procedure
Queues should be activated exclusively for error analysis by SAP.
To deactivate the queues again, enter the OK code
=DBG- .