DII0021 tdpid SUBSYSTEM CONNECTION IS STOPPED
Explanation:
A transaction initiated a request on a session using two-phase commit protocol but the identified IMS external subsystem was stopped.
Notes:
This message has been added to the job's system log and the transaction will be terminated with an IMS User 3044 ABEND.
Remedy:
Use the /START SUBSYSTEM command to start the subsystem prior to scheduling a transaction that requires it.