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PI71437: IPCONN DISCONNECTING AND FAILING TO RECONNECT

A fix is available

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APAR status

  • Closed as program error.

Error description

  • You are using transaction routing into CICS over an IPIC
    connection.  What you have happening is your IPCONN is
    disconnecting and is not reconnecting.  You would expect to see
    messages DFHIS2009 (released) and DFHIS2001 (acquired) but do
    not.  Using the CEMT INQ you see your IPCONN is in an acquired
    (ACQ) state.  TSO NETSTAT command shows the IP socket has
    closed but again the IPCONN still shows as acquired.
      You also start seeing messages:
    DFHIS1021 Session error occurred on RECEIVE IPIC session in
    IPCONN.
    DFHIS1015 Unable to accept connection for IPCONN ipconn. IPCONN
    client session state is invalid. Error code is (code X'0515').
      Your internal CICS trace table shows:
    SO 0E01 SOUS  EVENT - ASYNCIO_EXIT RETURN_VALUE(-1)
                   RETURN_CODE(140)  REASON_CODE(76697242)
    SO 0E20 SOUS  *EXC* - PEER_DISCONNECTED   RETURN_VALUE(-1)
                  RETURN_CODE(140) REASON_CODE(76697242)
    The connection is closed and you see
    IS 0906 ISZA  DATA  - IS7  ERROR  sense code X'08640001'.
    .
    CICS is failing to recognize the closed IP socket and recover
    the IPCONN
    Additional Symptom(s) Search Keyword(s): KIXREVRER
    

Local fix

  • n/a
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All CICS users.                              *
    ****************************************************************
    * PROBLEM DESCRIPTION: After a socket has been closed an       *
    *                      IPCONN is left in aquired state.        *
    ****************************************************************
    * RECOMMENDATION: .                                            *
    ****************************************************************
    CICS region contacts with another system via IPIC. Transaction
    routing request arrives in CICS and CISR is resumed to handle
    it. The related application task then gets resumed to run. It
    issues a synchronous web receive for the rest of the request
    but fails because the socket has been closed. To handle this
    exception, CICS tries to resume the CISE task by adding this
    error session into the CISE error queue, but this fails because
    the session token used is null. Therefore, the IPIC connection
    can not be released and remains in ACQuired status.
    

Problem conclusion

  • DFHISSR has been changed to make sure CISE can be notified if
    the synchronous web receive failed because the socket closed.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI71437

  • Reported component name

    CICS TS Z/OS V5

  • Reported component ID

    5655Y0400

  • Reported release

    900

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-10-28

  • Closed date

    2017-01-04

  • Last modified date

    2017-03-26

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

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

    PI72546 UI43677 PI78811

Modules/Macros

  • DFHISSR
    

Fix information

  • Fixed component name

    CICS TS Z/OS V5

  • Fixed component ID

    5655Y0400

Applicable component levels

  • R900 PSY UI43677

       UP17/02/01 P F701

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.

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Document Information

Modified date:
26 March 2017