PI71743: INCORRECT TCP STACK SELECTED WHEN USING TCPSTACK=SINGLE TCPNAME=

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Channel Initiator CHIN CHINIT experiences message ICH408I.
  Incorrect TCP stack is checked.
  CSQ1CHIN accesses tcpip stack TCP1 when the Listener is started
  and tcpstack is single. Incorrect TCPNAME is selected.
  TCPSTACK=SINGLE
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All users of IBM MQ for z/OS Version 9 Release 0             *
  * Modification 0.                                              *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * Message ICH408I issued when starting an MQ listener with     *
  * TCPSTACK=SINGLE                                              *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When starting an MQ TCP/IP listener with TCPSTACK=SINGLE, a
  TCP/IP socket is opened before the listener TCB has established
  affinity to the TCP/IP stack named in the TCPNAME parameter.
  
  Where access to any additional TCP/IP stacks on the system is
  prohibited by RACF security controls on the EZB.STACKACCESS.**,
  EZB.INITSTACK.**, or EZB.** profiles for class SERVAUTH then
  message ICH408I may be issued.
  
  This is caused by the listener TCB failing to set an affinity to
  the configured TCP/IP stack, prior to opening a socket to test
  the available protocols.
  

Problem conclusion

• Processing has been amended to ensure that affinity to the
  TCP/IP stack named in the TCPNAME parameter is established prior
  to opening a socket.
  

Temporary fix

Comments

• ×**** PE17/08/29 FIX IN ERROR. SEE APAR PI86572  FOR DESCRIPTION
  

APAR Information

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

  PI67827

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

  UI42617 010PC2Ÿ

Modules/Macros

• CSQXRCTL
  

Fix information

• Fixed component name

  MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R000 PSY UI42617

     UP17/01/10 P F701

Fix is available

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