PK17924: TERMINAL HANG AFTER DFHZC3438 SENSE 0831 ON SESSIONC START DATA TRAFFIC

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Running CICS, you see the following messages:
  DFHZC2456 E 13/10/05 22:11:03 CICSPT3P TBCS CSNE Exception
       response received to a command.  VTAM RETURN CODE 0404 ((3)
       Module name: DFHZSYX)
  DFHZC3438 E 13/10/05 22:11:03 CICSPT3P TBCS CSNE Device powered
      off.  SENSE CODE 0831 0000 ((1) Module name: DFHZNAC)
  RPL_A    TBCS,CSNE,22:11:03,00002570 92CE3C3E 92CE3ED4 00040400
                              00000004 04000080 0004FB48 00000000
                              00000000 F0000295 08000000 00000000
                              00000000 00000000 00000000 00000000
                              00008E00 20000000 00000000 00000000
                              00000000 00000000 08310000 2152E030
                              00000000 00000000 00000000 00000000
  
  
   TCTTE    TBCS,CSNE,22:11:03,E3C2C3E2 B9000005 2152E034 00000000
                               00000000 00000000 21A073A0 14000000
                               00000000 0C404040 C5D5E400 00000090
                               00000000 00000000 00000000 00000000
                               00000000 00000000 00000000 00000000
                               00000000 02400000 00000000 21A05AE0
                               00000000 08000000 00000000 21878930
  
  CICS was issuing a SESSIONC for SDT, and this was rejected
  by the device.  The terminal hangs after this until
  manual intervention- like issuing vtam vary inact, is done which
  then terminates the session.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: Terminal hang after DFHZC3438 SENSE     *
  *                      0831 on SESSIONC START DATA TRAFFIC.    *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  As part of session establishment CICS sends a Start Data Traffic
  SDT command which is rejected with SENSE0831 DEVICE POWERED OFF.
  The CICS SYNAD exit DFHZSYX processes the '0404'x completion
  code setting up message DFHZC2456(3). DFHZNAC runs to issue the
  MSGDFHZC2456, one of the actions for the message is CLSDST which
  would normally cause the session to be UNBOUND. Prior to taking
  any actions DFHZNAC calls DFHZNCS to report the SENSE 0831 with
  MSGDFHZC3438. DFHZNCS cancels all the previous actions including
  CLSDST expecting an LUSTATUS command to be received on the
  session when the device becomes available. However in this case
  LUSTAT is not allowed to flow because the SDT exchange did not
  complete. Consequently CICS waits for an LUSTAT that will never
  arrive leaving the device hung indefinitely.
  
  Additional keywords: 08310000
  

Problem conclusion

• CICS has been changed so that DFHZNCS will not cancel all
  previous actions from message DFHZC2456(3) if a SDT command was
  rejected with SENSE0831. The CLSDST action will cause CICS to
  send an UNBIND on the session.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

  PK13857

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

  UK11155

Modules/Macros

•    DFHZNAC  DFHZNCA  DFHZNCS  DFHZSYX
  

Fix information

• Fixed component name

  CICSTS 3.1 Z/OS

• Fixed component ID

  5655M1500

Applicable component levels

• R400 PSY UK11155

     UP06/01/31 P F601

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.