I'm using openldap-2.3.32, loglevel = -1 (log grows at 2MB/minute), and neither of those tests work. I've even tried with and without the @REALM.
I would advise you to upgrade to a supported release, rather than using one that contains numerous known issues. 2.3 is no longer supported, and the current stable release is 2.4.23. The last 2.3 release was 2.3.43. Either way, you are significantly behind modern times, and some serious bugs were fixed between 2.3.32 and 2.3.43.
--Quanah -- Quanah Gibson-Mount Sr. Member of Technical Staff Zimbra, Inc A Division of VMware, Inc. -------------------- Zimbra :: the leader in open source messaging and collaboration