CICS startup and the z/OS Communications Server session

In an SNA network, the session between CICS® and the z/OS® Communications Server is started automatically if the Communications Server is started before CICS.

If the z/OS Communications Server is not active when you start CICS, you receive the following messages:

F vtamname,USERVAR,ID=generic-applid,VALUE=specific-applid
+DFHSI1589D 'applid' VTAM is not currently active.
+DFHSI1572 'applid'  Unable to OPEN VTAM ACB - RC=xxxxxxxx, ACB CODE=yy.

If you receive messages DFHSI1589D and DFHSI1572, you can start the CICS-z/OS Communications Server session manually when the Communications Server eventually starts, by using the CEMT SET VTAM OPEN command from a supported MVS™ console or a non-Communications Server terminal.

If the z/OS Communications Server is active, but CICS still cannot open the SNA ACB because Communications Server does not recognize the CICS APPLID, you receive the following messages:

F vtamname,USERVAR,ID=generic-applid,VALUE=specific-applid
+DFHSI1592I 'applid' CICS applid not (yet) active to VTAM.
+DFHSI1572  'applid' Unable to OPEN VTAM ACB - RC=00000008, ACB CODE=5A.

This might be caused by an error in the value of APPLID operand, in which case you must correct the error and restart CICS. For information about other causes and actions, see CICS messages.