Preventing queue managers receiving messages

You can prevent a cluster queue manager from receiving messages it is unauthorized to receive by using exit programs.

About this task

It is difficult to stop a queue manager that is a member of a cluster from defining a queue. There is a danger that a rogue queue manager joins a cluster, and defines its own instance of one of the queues in the cluster. It can now receive messages that it is not authorized to receive. To prevent a queue manager receiving messages, use one of the following options given in the procedure.

• A channel exit program on each cluster-sender channel. The exit program uses the connection name to determine the suitability of the destination queue manager to be sent the messages.
• A cluster workload exit program, which uses the destination records to determine the suitability of the destination queue and queue manager to be sent the messages.