Top Secret LDAP can have a sudden abend:
IEF450I CALDAP CALDAP - ABEND=S522 U0000 REASON=00000000 982
The reason for the abend is not apparent.
This abend has been seen when TIME=NOLIMIT is specified in the CALDAP Proc step. Tasks can build up in an SVC wait state for an unspecified period of time.
Changing the parameter to TIME=1440 should stop the abend from occurring.