IT45968: Connection from a backlevel client sending an MQCSP structure isrejected when PasswordProtection=warn

APAR status

• Closed as program error.

Error description

• In some scenarios - for example if a channel security exit is
  used - it is valid for a remote IBM MQ client earlier than
  version 8 to provide user credentials to the queue manager
  using an MQCSP flow.
  
  In this scenario, if the non default option
  PasswordProtection=warn is configured in the qm.ini file, an
  AMQ9297W warning message is generated in the queue manager
  error log as expected, but the connection is terminated.
  
  A failure data capture record (FDC) with probe ID RN107010 is
  generated by the amqrmppa process with the reason code
  rrcE_BAD_PARAMETER.
  

Local fix

• Update the remote client library to a supported version of IBM
  MQ, or configure the channel to use SSL/TLS.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users of IBM MQ who have set PasswordProtection=warn in the
  queue manager configuration file (qm.ini) and are connecting an
  application using an MQ client older than version 8 which is
  supplying username and password credentials via an MQCSP
  structure.
  
  As the password protection capability is only applicable to
  cleartext connections, the issue is not seen for clients using
  an SSL/TLS connection to the queue manager.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  A logic error without the PasswordProtection=warn logic branch
  meant that the connection was incorrectly terminated with a
  protocol error, instead of being allowed to continue running
  after the AMQ9297W warning message was issued.
  

Problem conclusion

• The logic error has been corrected in this scenario, so that the
  connection is accepted by the queue manager after the AMQ9297W
  warning message is issued.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.3 LTS   9.3.0.20
  v9.4 LTS   9.4.0.0
  
  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 V9.3

• Fixed component ID

  5724H7291

Applicable component levels