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This bug has been copied from bug #1614501 and has been proposed to be backported to 7.5 z-stream (EUS).

Build tested: 389-ds-base-1.3.7.5-26.el7_5.x86_64

On a fresh instance:
[root@server ds]# ldapsearch -xLLL -D cn=Directory\ Manager -w password -b cn=config -s base nsslapd-enable-nunc-stans
dn: cn=config
nsslapd-enable-nunc-stans: off

[root@server ds]# pstack $(pidof ns-slapd) | grep 'nunc-stans\|ns_' -c
0

Nunc-stans is disabled by default, 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.

https://access.redhat.com/errata/RHSA-2018:2757