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Use the TCP listener backlog option

 

When receiving on TCP/IP, a maximum number of outstanding connection requests is set. This can be considered a backlog of requests waiting on the TCP/IP port for the listener to accept the request.

The default listener backlog value on z/OS is 255. If the backlog reaches this values, the TCP/IP connection is rejected and the channel will not be able to start.

For MCA channels, this results in the channel going into a RETRY state and retrying the connection at a later time.

For client connections, the client receives an MQRC_Q_MGR_NOT_AVAILABLE reason code from MQCONN and should retry the connection at a later time.

 

Parent topic:

Defining a TCP connection

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