PK99511: TXSERIES APPLICATION SERVER HANG. CICS TS ON Z/OS SENDING SYNC LEVEL 2 MESSAGE OVER IPIC CONNECTION

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Your TXSeries 7.1 is configured to communicate with CICS TS 3.2
  using an IPIC connection.  After a DPL from TXSeries to CICS TS,
  CICS TS sends a sync level 2 message back, when it should be
  sending a sync level 1 message.  The application server on the
  TXSeries platform is not expecting this, and it subsequently
  hangs.
  .
  Additional Symptoms And Search Keywords:
  KIXREVRBD
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All.                                         *
  ****************************************************************
  * PROBLEM DESCRIPTION: TXSeries server hangs when sending in a *
  *                      DPL request over an IPIC connection.    *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  A TXseries application server may hang when sending a DPL
  request over an IPIC connection. The application in CICS then
  issued a DPL request back to TXSeries. During syncpointing CICS
  TS did not realise that the RM link it had for the second DPL
  was for TXSeries. TXSeries does not support two phase commit.
  CICS TS sent a perform prepare message which TXSeries was not
  expecting and the TXSeries application server was left hanging.
  

Problem conclusion

• DFHISJU has been changed to turn a two phase commit request to a
  single phase commit request if the remote system does not
  support two phase commit.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

  PK98844

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

  UK60536

Modules/Macros

•    DESISUOW DFHISBU  DFHISCU  DFHISJU
  

Fix information

• Fixed component name

  CICS TS Z/OS V4

• Fixed component ID

  5655S9700

Applicable component levels

• R600 PSY UK60536

     UP10/09/23 P F009

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.