https://bugs.openldap.org/show_bug.cgi?id=10102
--- Comment #6 from Daniel Chan daniel.hy.chan@pccw.com --- I have tried upgrade from 2.4.23-> 2.4.59. it is worked. However, if I want to upgrade from 2.4.23-> 2.6.xx, please advise the details procedure. Thank you in advance