https://bugs.openldap.org/show_bug.cgi?id=9262
--- Comment #4 from jeremy.diaz@rexconsulting.net --- None of the entries in our database make use of the ref attribute. The only referrals being used are those set through the chain overlay for the olcDbURI attribute. One thing I noticed is that when a config conversion is done through slaptest, a 0th chain overlay ldap backend entry is added with no dbURI attribute. I do not see anywhere else that could be missing a ref.