PM37030: DSNL511I DSNLIENO TCP/IP CONVERSATION FAILED SOCKET=RECV RETURN CODE=1121 REASON CODE=00000000

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• DB2DDF DB2TCPIP defect pm37030 dpm37030
  DSNL511I messages with RETURN CODE=1121 may be issued by DB2
  when the socket is cancelled and there is no transaction in
  progress.
  RETURN CODE 1121 is ECONNRESET
  The message is informational.
  
  Example of message:
  
  DSNL511I DSNLIENO TCP/IP CONVERSATION FAILED
  TO LOCATION (ipaddr)
  IPADDR=(ipaddr) PORT=(port)
  SOCKET=RECV RETURN CODE=1121 REASON CODE=00000000
  ********************************************
  Additional keywords and symptoms:
   DB2 DSNL511I MSGDSNL511I L511
   ECONNRESET 1121
  

Local fix

• no local workaround or fix
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All Distributed Data Facility (DDF) users.   *
  *                 Specifically where remote client             *
  *                 applications uses TCP/IP to access a         *
  *                 DB2 for z/OS server.                         *
  ****************************************************************
  * PROBLEM DESCRIPTION: Many occurrences of message DSNL511I    *
  *                      with RETURN CODE=1121 and               *
  *                      REASON CODE=00000000 may appear in the  *
  *                      system log.                             *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When a remote client application is accessing a DB2 for z/OS
  server via TCP/IP and closes its connection with DB2, message
  DSNL511I with RETURN CODE=1121 and REASON CODE=00000000 may be
  issued by CSECT DSNLIENO. This typically occurs because the
  remote client system did not close the TCP/IP socket connection
  gracefully on the application's behalf.
   Note: Not all remote client systems that access a DB2 server
    using TCP/IP will cause this message DSNL511I to occur. Only
    those remote client systems that do not gracefully close the
    TCP/IP socket connection may cause this DSNL511I message to
    occur.
  It is important to understand that the DSNL511I message with
  RETURN CODE=1121 and REASON CODE=00000000 reports that a
  connection is being reset by the peer (remote client system),
  and this could be due to an abnormal or normal condition.
  If the connection is reset (by the peer) while a transaction
  IS in progress, then this is considered to be an abnormal
  condition and it is therefore necessary for DB2 to issue the
  message.
  If the connection is reset (by the peer) while a transaction
  IS NOT in progress, then this likely indicates a normal
  condition in which case the DSNL511I message is basically
  noise and therefore is erroneous and can be suppressed.
  

Problem conclusion

• DB2 has been changed to suppress the DSNL511I message, with
  RETURN CODE=1121 and REASON CODE=00000000, if the remote client
  system is closing its connection with DB2 while a transaction
  is not in progress.
  

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:

  UK68870 UK68871

Modules/Macros

• DSNLIENO
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RA10 PSY UK68870

     UP11/07/02 P F107

• R910 PSY UK68871

     UP11/07/02 P F107

Fix is available

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