IT40943: Establishing a new channel instance between multi-instance queuemanagers might intermittently enter a retry loop

APAR status

• Closed as program error.

Error description

• IBM MQ channels goes to retry mode intermittently on
  multi-instance environment
  Errors noticed on error log:
  AMQ9524E: Remote queue manager unavailable.
  AMQ9202E: Remote host not available, retry later
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users using comma separated multiple connames in their channel
  definition may hit this issue, especially when one of the
  conname is not reachable and attempt is being made to reconnect
  with the other conname.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  A logic error meant that in the event of a failure reading an
  internal MQ data file as part of the channel startup, the
  failure to start the channel was not correctly communicated to
  the remote side of the channel, which meant the remote side did
  not immediately retry the connection, even if another connname
  for the channel was available.
  

Problem conclusion

• The inbound channel logic has been corrected to correctly return
  an error to the remote peer if a failure occurs when reading the
  config file.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.2 LTS   9.2.0.25
  v9.3 LTS   9.3.0.20
  v9.x CD    9.3.6
  
  The latest available maintenance can be obtained from
  'IBM MQ Recommended Fixes'
  https://www.ibm.com/support/pages/recommended-fixes-ibm-mq
  
  If the maintenance level is not yet available information on
  its planned availability can be found in 'IBM MQ
  Planned Maintenance Release Dates'
  https://ibm.biz/mqplannedmaintenance
  
  ---------------------------------------------------------------
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  MQ BASE V9.2

• Fixed component ID

  5724H7281

Applicable component levels