CICS region gets MQ 2009 error Retries for 3 seconds and shuts down listener.
Snapshot of Console log:
 CASMQ5067E ES MQ Listener CICSMQ for CICSMQ.INITQ connection lost, reason: 2009, retrying... 18:02:27
 CASMQ5064E ES MQ Listener CICSMQ for CICSMQ.INITQ open failed, reason: 2009 18:02:30

Full article: https://portal.microfocus.com/s/article/KM000016876