PH02993: MQ Z/OS CSQX777E GENERATED IN CHIN WITH INCORRECT DATA IN 'ADDRESS' FIELD

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• MQ on z/OS
  Queue Manager using CHLAUTH.
  
  CSQX777E message is issued for a channel being blocked .
  An incorrect DNS entry is showing up in the message .
  

Local fix

• add an '*' (asterisk) to the end of the Address field in Channel
  Authorization Record.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 1 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Message CSQX777E 'channel has been      *
  *                      blocked' because the hostname used for  *
  *                      validation has invalid characters       *
  *                      appended.                               *
  ****************************************************************
  A client attempts to connect to a queue manager defined with
  CHLAUTH and REVDNS enabled. A channel authentication record has
  been defined to permit access which uses a hostname to identify
  the client rather than an IP address. However the client
  connection is rejected with message CSQX777E 'channel has been
  blocked'.
  The rejection occurs because additional characters have been
  appended to the hostname. This can occur when authorization
  processing copies the hostname in to a temporary buffer that
  contains residual storage from a previous connection attempt
  that used a longer hostname. The current hostname is written
  over the previous one for the length of the new hostname only,
  leaving residual characters from the previous hostname appended
  to the end.
  

Problem conclusion

• Authorization processing has been updated for the reported
  problem to initialize the temporary host entry buffer to nulls
  before the host entry is copied in to it.
  

Temporary fix

Comments

APAR Information

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

  PI99374

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

  UI59476

Modules/Macros

• CSQXTNSC
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R100 PSY UI59476

     UP18/12/15 P F812

Fix is available

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