PQ82903: A socket application is getting ECONNRESET (errno 54) to a receive socket call.

Obtain the fix for this APAR.

APAR status

• Closed as unreproducible.

Error description

• The application that is receiving the data received the data
  then did a close.  This caused an ack and a fin to be sent to
  the end of the connection that sent the data.  The fin was
  acked.  The application that sent the data did a shutdown for
  write.  This caused a fin to be sent to the end of the
  connection that is receiving the data.  This fin was acked.
  The connection is now in a closed state.  The application that
  sent the data now did a receive.  Tcpip returned  the receive
  with an errno ECONNRESET.  The connection was never reset.
  VERIFICATION STEPS:
   Get a ctrace with options socket, pfs, engine, tcp.
   Look for this in a pfs trace entry
     RetValue Errno ErrnoJr ScbFlags
     C5D9D9D5  FFFFFFFF  00000461  76650446
   Look at the state of the connection.  It will be KLOSED 01.
   The previous socket call will be a shutdown for write.
  KEYWORDS:
   Module: EZBTCFRD  ErrnoJr: 1094 JRSOCKETCONDROPPED
   ECONNRESET 1121
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of the IBM Communications Server   *
  *                 for OS/390 Release 10 IP and z/OS Version 1  *
  *                 Release 2 IP                                 *
  ****************************************************************
  * PROBLEM DESCRIPTION: A socket application is getting         *
  *                      ECONNRESET (errno 54) to a receive call *
  *                      after shutdown for write                *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The reported problem begins with the remote side sending
  the stack a FIN to close its side of the connection. The
  local socket application gets ECONNRESET (errno 54) to a
  receive call after it successfully issues a shutdown for write
  only on the socket. In this case the application should get
  a successful receive call because the remote side closed
  its connection with a FIN instead of a RST.
  +-------------------------------------------------------------+
  + Please check our Communications Server for OS/390 homepages +
  + for common networking tips and fixes.  The URL for these    +
  + homepages can be found in Informational APAR II11334.       +
  +-------------------------------------------------------------+
  

Problem conclusion

Temporary fix

Comments

• Code was amended in the TCP/IP stack to allow a receive call
  to complete successfully when the reported problem occurs.
  
  Additional Keywords: PTR MV24190 PTR MV28108 APAR PQ78674
  

APAR Information

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

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

  UQ84644 UQ84645

Modules/Macros

• EZBTCFRD EZBTCFSH EZBTCICT EZBTCPTM EZBTCSTR
  EZBTCUTL TOTCPDS
  

Fix information

• Fixed component name

  TCP/IP V3 MVS

• Fixed component ID

  5655HAL00

Applicable component levels

• R120 PSY UQ84644

     UP04/02/17 P F402

• R50A PSY UQ84645

     UP04/02/17 P F402

Fix is available

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