*** Bug 1751123 has been marked as a duplicate of this bug. ***
I can change/delete secure listen host successfully:
Successfully updated security configuration. You must restart the Directory Server for these changes to take effect.
Marking as VERIFIED.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.