IT43502: Managed .NET client using distributed transaction reports MQRC_HCONN_ERROR (2018) while using MQCNO_HANDLE_SHARE_NONE

APAR status

• Closed as program error.

Error description

• A managed .NET client using distributed transactions and
  MQCNO_HANDLE_SHARE_NONE set on the connect options, reports
  MQRC_HCONN_ERROR (2018) in Windows. MQRC_HCONN_ERROR (2018) is
  thrown after MSTDC creates a new thread for Commit.
  

Local fix

• Connect option MQCNO_HANDLE_SHARE_BLOCK can be used as a
  workaround.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All users who use a managed .NET client with distributed
  transactions and MQCNO_HANDLE_SHARE_NONE are affected.
  
  
  Platforms affected:
  Windows
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  A managed .NET client using distributed transactions and
  MQCNO_HANDLE_SHARE_NONE set on the connect options, gives
  MQRC_HCONN_ERROR (2018) in Windows. The problem occurred when a
  new thread, which is created by MSTDC to perform commit tried to
  acquire a mutex. As MQCNO_HANDLE_SHARE_NONE creates a non-shared
  connection, the new thread could not acquire the lock, which
  resulted in the MQRC_HCONN_ERROR (2018) error response.
  

Problem conclusion

• The coding error which caused the MQRC_HCONN_ERROR(2018) has
  been corrected so that the application an perform a commit when
  distributed transaction is used.
  
  ---------------------------------------------------------------
  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