CICS TCP/IP traffic stops or hangs after upgrading to z/OS 1.13

Technote (troubleshooting)


Your CICS Transaction Server for z/OS (CICS TS) region socket activity is hanging because TCP/IP connectivity appears to be broken after you upgrade to z/OS V1.13. CICS might be processing Web requests coming into it and then all of a sudden it just stops. There are no abends and no error messages within CICS, nothing to indicate any type of problem.


The CICSPlex SM Web User Interface (CPSM WUI) might also stop responding.

Resolving the problem

Apply PTF UA64875 for z/OS V1.13 HIPER APAR OA38842 to fix this problem.

If you have this problem, you might be able to get the TCP/IP traffic flowing again by closing and reopening the TCPIP service:

  1. Enter CEMT INQ TCPIPService in the CICS region

  2. Tab down to "Ope" and overtype it with "Clo" and press the enter key

  3. Overtype "Clo" with "Ope" and press the enter key

If the TCP/IP traffic is still hanging after closing the TCP/IP service, you can try to close and open CICS internal sockets support:
  1. Enter CEMT INQ TCPIP in the CICS region

  2. Tab down to "Ope" and overtype it with "Clo" and press the enter key

  3. Overtype "Clo" with "Ope" and press the enter key

You will have to bring the CICS region down and back up if closing and opening both the TCP/IP service and CICS internal socket support fails to get the TCP/IP traffic flowing.

If TCP/IP traffic stops after applying PTF UA64875, you should start OMVS component trace and take a console dump of CICS, TCP/IP, and OMVS. Then CICS Support can use the trace and dump to troubleshoot the problem.
  1. Start the trace before the hang occurs
    r nn,OPTIONS=(ALL),END

  2. Take the dump when the TCP/IP traffic is hanging:
    DUMP COMM=(hang)
    r xx,JOBNAME=(TCPIP,OMVS,<CICS Region Jobname>),CONT
    r yy,DSPNAME=('OMVS'.*),CONT

  3. Stop the trace (because there can be some performance impact):

Product Alias/Synonym

CICS/TS CICS TS CICS Transaction Server

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Document information

More support for:

CICS Transaction Server

Software version:

3.1, 3.2, 4.1, 4.2

Operating system(s):


Reference #:


Modified date:


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