Just have a look :
WebSphere MQ for z/OS
Messages and Codes
CSQ3201E ABNORMAL EOT IN PROGRESS FOR
USER=user CONNECTION-ID=conn-id
THREAD-XREF=thread-xref
Explanation: Abnormal termination processing has
been started for the agent with the values for the
USER, CONNECTION-ID, and THREAD-XREF shown.
the terminating agent.