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KAINT (keepalive) for an orphaned client channel in IBM MQ for z/OS

Troubleshooting


Problem

You observe a SVRCONN client channel with a STATUS of RUNNING, or RUN on the CSQOREXX panels, even though the network connection to the client stopped. If there are uncommitted gets or puts, after 2 log archives you will see the following message:
 CSQJ160I CSQ1 CSQJLRUR LONG-RUNNING UOW FOUND, URID=urid CONNECTION NAME=CSQ1CHIN
or after 3 checkpoints:
 
 CSQR026I LONG-RUNNING UOW SHUNTED TO RBA=rba, URID=urid CONNECTION NAME=CSQ1CHIN
The client application is no longer available, but the client channel is in a TCP/IP RECEIVE state according to the SUBSTATE of a DISPLAY CHSTATUS command.  The substate information is also available in the channel status information in a dump of the MSTR and CHIN.

Symptom

Other symptoms might include one of these error messages in the CHIN log:

CSQX489E Maximum instance limit limit exceeded, channel channel-name connection conn-id 
CSQX490E Maximum client instance limit limit exceeded, channel channel-name connection conn-id
CSQX513E Current channel limit exceeded, channel channel-name connection conn-id 
CSQX573E Channel channel-name exceeded active channel limit

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Document Information

Modified date:
28 April 2025

UID

swg21232484