Check the startup messages in the CICS job log for an explanation of why the VTAM ACB failed to open. Check to make sure that the CICS VTAM ACB is active. If it is not, vary the ACB active with the VTAM vary command and issue the CEMT SET,VTAM,OPEN transaction in CICS to establish VTAM communications. If you are still having difficulty, contact the staff responsible for VTAM at your installation.
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