Establishing the cause of the problem

Introduction to problem determination
How this book can help you
How this book is organized
Preliminary checks
Has WebSphere MQ for z/OS run successfully before?
Are there any error messages or return codes that explain the problem?
Can you reproduce the problem?
Have any changes been made since the last successful run?
Has the application run successfully before?
Does the problem affect specific parts of the network?
Does the problem occur at specific times of the day?
Does the problem affect all users of the application?
Does the problem occur with all z/OS, CICS, or IMS systems?
Is the problem intermittent?
Have you applied any APARs or PTFs?
Do you have a program error?
What to do next
Examining the problem in greater depth
Have you obtained some incorrect output?
Have you received an unexpected error message?
Has there been an abend?
Common causes of abends
Address space dumps and transaction dumps
Abnormal program termination
Have you failed to receive a response from an MQSC command?
Is there a problem with the WebSphere MQ queues?
Are some of your queues working?
Are the correct queues defined?
Does the problem affect only remote or cluster queues?
Does the problem affect only shared queues?
Is your application or WebSphere MQ for z/OS running slowly?
Has your application or WebSphere MQ for z/OS stopped processing work?
Check for error messages
No error messages issued
Has the queue manager or channel initiator terminated abnormally?
WebSphere MQ for z/OS might still be running
Where to look next