PH41705: CSQX208E TRPTYPE=TCP RC=00000461 (ECONNRESET) REASON=76650446 WHEN USING COMPMSG( ZLIBFAST ) ON A SVRCONN CHANNEL

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Using COMPMSG ZLIBFAST on an SVRCONN channel produces CSQX208E
  RC=00000461 (ECONNRESET) reason=76650446 and on client side
  AMQ9504E RM680010 rriBadDataReceived  when the z/OS sending
  side tries to correctly round up  the size of the network flows
  for SHARECNV SVRCONNs when being
  compressed by zlib. This does not normally cause any obvious
  issues  until we need to send multiple flows in sequence and
  the first one does not have its size rounded up. Customer
  noticed this when sending messages (~360 KB) caused the
  protocol error on the client side.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 1 Modification 0, Release 2          *
  *                 Modification 0 and Release 3 Modification 0. *
  ****************************************************************
  * PROBLEM DESCRIPTION: When using message compression          *
  *                      (COMPMSG ZLIBFAST) on a SVRCONN         *
  *                      channel, the channel may terminate with *
  *                      message CSQX208E.                       *
  ****************************************************************
  The compression logic does not align transmitted messages to
  the next 4 byte boundary. This is required by the wire protocol
  to ensure compatibility with platforms which require
  aligned access on a 4-byte boundary. This results in an FFST on
  the receiving platform due to a 4-byte boundary alignment
  check being performed, causing the channel to terminate.
  

Problem conclusion

• The compression logic has been updated to align compressed
  messages to the next word boundary.
  

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:

  UI81597 UI81598 UI81599

Modules/Macros

• CSQXRCMP
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R100 PSY UI81599

     UP22/08/03 P F208

• R200 PSY UI81598

     UP22/08/03 P F208

• R300 PSY UI81597

     UP22/08/03 P F208

Fix is available

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