PM83825: DFHSO0126 CREATE SOCKET FAILED, MAXSOCKETS LIMIT REACHED AFTER MANY SOCKET ERRORS FOR LONG RUNNING TASKS

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• You have long running tasks in CICS issuing EXEC CICS INVOKE
  WEBSERVICE that experience socket errors such as socket connect
  failures.
  .
  DFHWBCL is responsible for creating and connecting the new
  socket. If this succeeds, the socket reference is held in a WBO
  block (web session block). The web session block is returned to
  the webservice pipeline component of CICS. The pipeline code
  will close this web session (which closes and deallocates the
  

Local fix

• Terminate long running task and restart it.
  KIXREVRJL
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users                               *
  ****************************************************************
  * PROBLEM DESCRIPTION: MAXSOCKETS limit reached after many     *
  *                      sockets connecting errors for long      *
  *                      running tasks.                          *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Long running tasks in CICS issuing EXEC CICS INVOKE
  WEBSERVICE that experience sockets connect failures.
  
  DFHWBCL open_session is responsible for creating the web
  session from client to server. It creates and connects the
  new socket. The code will not close the socket if its
  connecting fails.
  
  Generally, CICS will close the socket during task end by
  recovery manager. The sockets will remain in CICS if it's a
  long running task. CICS then reaches MAXSOCKETS limit after
  many socket connect errors for those long running tasks.
  

Problem conclusion

• DFHWBCL has been changed to clean up the socket related
  resources just after its connecting failure.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

  PM79119

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

  UK92768 UK92769

Modules/Macros

•    DFHWBCL
  

Fix information

• Fixed component name

  CICS TS Z/OS V4

• Fixed component ID

  5655S9700

Applicable component levels

• R600 PSY UK92768

     UP13/03/29 P F303

• R700 PSY UK92769

     UP13/03/29 P F303

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.