PK36358: CICS SOCKET SEND CANNOT BE TIMED OUT FOR AN FMH-7 ERROR RESPONSE TO A CLIENT.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• There was a previous error with a mirror task on a SOCKET SEND
  and CICS is trying to send the error response back to the
  client.  DFHTFP starts this and since the client is using ECI
  over TCPIP, DFHIEIE is invoked to send the FMH-7 and DFHSOCK
  does the SOCKET SEND.  If the client is not receiving for some
  reason, the SOCKET will remain in this wait and it could lead
  to maxtask, especially if the client continues to send requests
  to CICS.  In this particular case, the client was the CTG that
  was still sending requests to CICS but had stopped receiving
  and this drove CICS to MXT.
  

Local fix

• Close the TCPIPSERVICE and this will free the sockets.
  Investigate the problem with the client not receiving the SEND
  from CICS.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All                                          *
  ****************************************************************
  * PROBLEM DESCRIPTION: ECI over TCPIP task stuck sending an    *
  *                      FMH7 to a client cannot be timed out or *
  *                      purged.                                 *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  An ECI over TCPIP mirror task attempts to send a normal response
  to a client. The socket SEND hangs due to problems at the client
  end. Eventually this SEND times out due to DTIMOUT. The mirror
  task is abended AITH. During transaction termination, an attempt
  is made to send an FMH7 to the client. This SEND also hangs.
  However, the task is now purge protected as it is in transaction
  termination. DTIMOUT is therefore prohibited and in fact the
  task cannot be PURGED/FORCEPURGED or KILLED. Other tasks back up
  behind the first task trying to send down the same socket
  causing a backlog of tasks in CICS.
  
  ADDITIONAL KEYWORDS :- MAXTASKS abendAITH
  

Problem conclusion

• DFHIEIE has been changed to use a default timeout of 5-seconds
  when sending an FMH-7 to a client.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

  PK32742

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

  UK21530

Modules/Macros

•    DESIEIE  DFHIEIE
  

Fix information

• Fixed component name

  CICSTS 3.1 Z/OS

• Fixed component ID

  5655M1500

Applicable component levels

• R400 PSY UK21530

     UP07/01/30 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.