IT33972: MQ client connection fails with data conversion error AMQ9541E

APAR status

• Closed as program error.

Error description

• An MQ client channel connection to the queue manager using
  SHARECNV(0) breaks after upgrading to MQ 9.1.4 CD or later.
  The following error following error  is recorded in the queue
  manager error log:
  
  ----- amqrmrsa.c : 961
  --------------------------------------------------------
  08/10/2020 07:30:50 AM - Process(31738.77467) User(mqm)
  Program(amqrmppa)
                      Host(xxxxx) Installation(Installation1)
                      VRMF(9.1.5.0) QMgr(TESTQMGR)
                      Time(2020-08-09T23:30:50.283Z)
                      ArithInsert1(41987) ArithInsert2(932)
  
  AMQ9541E: CCSID supplied for data conversion not supported.
  

Local fix

• Use a SHARECNV setting greater than 0 on the SVRCONN channel.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All MQ distributed users with MQ clients using SHARECNV(0) which
  connect to an MQ server of the opposite endianness.
  
  
  Platforms affected:
  AIX, IBM iSeries, Linux on Power, Linux on x86-64, Linux on
  zSeries, Windows
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  When a client issues an MQGET with a long wait interval, the
  queue manager will send a periodic heartbeat flow to the client
  based on the negotiated HBINT value of the channel.  MQ 9.1.4
  introduced a problem in which this heartbeat flowed correctly
  once for a SHARECNV(0) connection, but the queue manager then
  forgot whether byteswapping was required, for example between a
  little-endian client and a big-ending queue manager (or vice
  versa).  Any subsequent request from the client was then
  misinterpreted by the queue manager as having an invalid CCSID
  value, causing the queue manager to write a message AMQ9541
  ("CCSID supplied for data conversion not supported").  The
  AMQ9541 message included values like CCSID 13059 (the
  un-byteswapped version of CCSID 819), or CCSID 47108 (the
  un-byteswapped version of CCSID 1208), or other invalid CCSID
  values.
  

Problem conclusion

• A code change has been made to ensure the queue manager cannot
  forget whether a SHARECNV(0) client connection requires
  byteswapping.  As a result of this change, the AMQ9541 message
  is no longer issued after an MQGET with a long wait interval
  causes the queue manager to exchange heartbeats with the client.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.2 LTS   9.2.0.6
  v9.x CD    9.3.0.0
  
  The latest available maintenance can be obtained from
  'WebSphere MQ Recommended Fixes'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
  
  If the maintenance level is not yet available information on
  its planned availability can be found in 'WebSphere MQ
  Planned Maintenance Release Dates'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
  ---------------------------------------------------------------
  

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

  IBM MQ BASE MP

• Fixed component ID

  5724H7271

Applicable component levels