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

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

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
   TRACE CT,64M,COMP=SYSOMVS
   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
   r zz,SDATA=(RGN,LSQA,SWA,TRT,ALLNUC,LPA,PSA,SUM,CSA,SQA),end
   
   
3. Stop the trace (because there can be some performance impact):
   TRACE CT,OFF,COMP=SYSOMVS