PQ03283: CICS SOCKETS LISTENER(CSKL) DOES NOT CORRECTLY RECOVER FROM ACCEPT() ERRNO 61.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Under certain network situations the CICS socket interface
  Listener will fail with errno 61 on the accept() socket call.
  The following message is seen in the CICS log:
  EZY1188E 04/07/97 16:08:41 ACCEPT API FAILED   ERR=00000061
  .
  After this occurs no other remote connections are accepted by
  the CSKL. A recycle of the Listener is required to
  recover using CSKD/CSKE.
  

Local fix

• Additional Symptoms:
  Listener fails to accept new connection after any
  accept failure(errno)
  Verification Steps:
  Review of a moretrace socket shows the accept failure with
  errno 61. The Listener then goes back into issuing Select
  calls, but the read mask set on the select is null. The only
  valid value is the timeout of 60 seconds. The following is an
  example of a select issued after the acept failure:
  EZB7273I Data, length = 4:
  EZB5062I D78560:00000033 <---Max sockets
  EZB7273I Data, length = 16:
  EZB5062I D78564:00000100 00000100 00000000 00000100
  EZB7273I Data, length = 8:
  EZB5062I D78544:0000003C 00000000 <----60 second timeout
  EZB7273I Data, length = 8:
  EZB5062I 27D598:00000000 00000000 <----Zero Read mask
  EZB7273I Data, length = 8:
  EZB5062I 27D320:00000000 00000000
  EZB7273I Data, length = 8:
  EZB5062I 27D0A8:00000000 00000000
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of MVS TCP/IP V3R1 and V3R2        *
  *                 CICS environment.                            *
  ****************************************************************
  * PROBLEM DESCRIPTION: CICS sockets listener does not          *
  *                      correctly recover from Accept() errno   *
  *                      61 (ECONNREFUSED).                      *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  CICS sockets listener does not correctly recover from Accept()
  errno 61. The current implementation is intended to handle a
  congestion scenario however, there are cases where failure on
  the Accept() was due to different reasons (ie. remote client
  resetting the connection).
  

Problem conclusion

• The CICS socket listener (CSKL) has been amended to
  handle errnos occurring on the Accept() differently and
  therefore avoid the reported problem.
  
  * Cross Reference between External and Internal Names
  

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:

  UQ04199 UQ04200 PQ09642

Modules/Macros

• EZACIC02
  

Fix information

• Fixed component name

  TCP/IP V3 MVS

• Fixed component ID

  5655HAL00

Applicable component levels

• R311 PSY UQ04199

     UP97/05/09 P F705

• R321 PSY UQ04200

     UP97/05/07 P F705

Fix is available

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