Steps for diagnosing hung CICS tasks

Determine why CICS® application tasks hang.

Procedure

Perform the following steps:

  1. While a task is hung, request an SVC dump of CICS and TCP/IP.
  2. If the problem can be re-created, re-create with CICS auxtrace and component trace turned on.
  3. Issue a NETSTAT SOCKET command to determine whether the task is waiting for a particular socket call to be posted. If it is waiting, you can issue the NETSTAT DROP command to end it.
  4. If the application is hung while waiting for the completion of a READ command, consider issuing a SELECT or SELECTEX command prior to the READ command. The SELECT command returns either the number of sockets that are ready to be read or 0 if it times out. The SELECTEX command also returns either the number of sockets that are ready to be read or 0 if it times out and it also returns an ECB or a list of ECBs.
Parent topic: CICS sockets application problems