Because the ACB for the VTAM® termination subtask ISTATM00 could not be opened successfully, the VTAM termination subtask could not be initialized.
If the user's application program abnormally terminates or terminates without issuing a CLOSE ACB, VTAM cannot close that application’s ACB. Since VTAM cannot terminate until all application programs have closed their ACB, VTAM could probably never terminate when a HALT command is entered. Other VTAM processing continues.
Halt VTAM immediately. If a dump was taken as indicated by message IST413I, print the dump. Save the system log and network logs for problem determination.
See z/OS Communications Server: SNA Diagnosis Vol 1, Techniques and Procedures for more information on termination problems.
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