OW55270: CP-CP SESSION NOT COMING ACTIVE DUE TO NNSPREF SWITCHOVER IN PROGRESS NOT BEING RESET

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• CP-CP session not coming active due to NNSpref switchover in
  progress not being reset.
  Possible sense codes 08420001 & 083E0004
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: ALL End Nodes using NNSPREF.                 *
  ****************************************************************
  * PROBLEM DESCRIPTION:   After a link outage and recovery,     *
  *                      CP-CP session activation from a VTAM EN *
  *                      to its preferred NNS fails and the      *
  *                      EN can no longer establish a CP-CP      *
  *                      session with any NNS.                   *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
    The link from a VTAM EN to its preferred NNS was inactive.
  So, the EN was in session with an alternate NNS.  The link to
  the preferred NNS came active and caused the EN to go into the
  NSPREF switchover process.  The existing NNS session was
  terminated with sense 08B50000 and the session to the preferred
  NNS was attempted.
    Before the session to the preferred NNS was attempted, the
  link to the preferred NNS failed.  This caused the the session
  to the preferred NNS to fail with 80140001.  The EN then tried
  to set up a session to the alternate NNS, but this failed with
  08B50000 because the NNSPREF switchover bit was not reset.  From
  that point, the EN could no longer establish a CP-CP session
  with any NNS.
  

Problem conclusion

• ISTSCWFM was changed to properly reset the NNSPREF switchover
  bit when the session to the preferred NNS fails.  ISTSCCFM was
  changed to properly handle the timed retry to the preferred NNS
  during the NNSPREF switchover process.
  

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:

  UW92818 UW92819 UW92820 UW92821

Modules/Macros

• ISTSCCFM ISTSCWFM
  

Fix information

• Fixed component name

  VTAM V4 MVS/ESA

• Fixed component ID

  569511701

Applicable component levels

• R10A PSY UW92819

     UP02/08/29 P F208

• R120 PSY UW92820

     UP02/08/29 P F208

• R140 PSY UW92821

     UP02/08/29 P F208

• R801 PSY UW92818

     UP02/08/29 P F208

Fix is available

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