We recently installed a new instance of OpenLDAP 2.4.23 running on RedHat Linux 6
That release is nearly 6 years old. You can contact RedHat for support for any issues you have with it. Otherwise, go the path of sanity and clarity, and run a modern current release. You may want to check out the LTB project builds (<http://ltb-project.org/wiki/download#openldap>), or if you want builds of OpenLDAP that come with support, I would suggest contacting Symas (http://www.symas.com)
--Quanah -- Quanah Gibson-Mount Platform Architect Zimbra, Inc. -------------------- Zimbra :: the leader in open source messaging and collaboration A division of Synacor, Inc