PI73008: IPIC connections are unresponsive after a CICS server restart.

CICS Transaction Gateway Desktop Edition V9.2 (all supported platforms)
CICS Transaction Gateway for Multiplatforms V9.2 (all supported platforms)
CICS Transaction Gateway for Multiplatforms V9.2 Fix Pack 2
CICS Transaction Gateway Desktop Edition V9.2 Fix Pack 2

APAR status

• Closed as program error.

Error description

• Intermittently a problem occurs where a Gateway daemon does not
  reconnect to IPIC connected CICS servers after the CICS servers
  have been restarted.
  
  The following messages might also be written to the CICS TG log:
  CTG8495E Communication failure for IPIC connection to CICS
           server <server_name> reason = java.io.IOException: End
           of stream
  CTG8433E Connection failure for IPIC connection to CICS server
           <server_name> reason =  java.net.Connect Exception:
           EDC8128I Connection refused
  
  Additional search words: msgCTG8495E msgCTG8495 CTG8495
  msgCTG8433E CTG8433 msgCTG8433
  

Local fix

• Restarting the Gateway daemon clears the problem.
  

Problem summary

• ***************************************************************
  * USERS AFFECTED: *
  * All users of CICS Transaction Gateway and IPIC connected *
  * CICS servers. *
  ****************************************************************
  * PROBLEM DESCRIPTION: *
  * IPIC sessions deadlocked and message IEE342I issued after *
  * SDSF modify command. *
  ****************************************************************
  * RECOMMENDATION: *
  ****************************************************************
  When CICS TG closes a number of IPIC sessions at the same time.
  It is possible for 2 sessions to deadlock on the same resource.
  In this deadlock one of the sessions can be holding a CICS TG
  statistics record while waiting for the deadlocked resource. If
  the CICS TG ZOSConsole thread then attempts to collect
  statistics it can also become deadlocked and issue the message
  IEE342I. Any further attempts to use CICS TG administration
  commands from the SDSF console will not complete. The Gateway
  daemon will continue to process ECI requests over IPIC sessions
  that are not affected by the deadlock. It is also possible that
  the IPIC session deadlock will hold statistics resources that
  will prevent scheduled statistics from being collected.
  A javacore dump will show the deadlocked CICS TG threads. A
  region dump of the CICS TG address space might also show the
  ZOSConsole thread in
  com.ibm.ctg.server.statistics.StatController$StatCollector.getSt
  ats.
  

Problem conclusion

• CICS TG has been changed to remove the reported deadlock on IPIC
  session closure.
  

Temporary fix

Comments

APAR Information

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

  PI59791

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

Modules/Macros

• CTG00201 CTG00204
  

Fix information

• Fixed component name

  CICS TRNS GATE

• Fixed component ID

  5724I8103

Applicable component levels

• R900 PSY

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