I'm feeling som kind of stupid I'm running openldap-servers-2.4.23-26.el6_3.2.x86_64 under Centos 6.3. Using ldapsearch I get this result: ldapsearch -h localhost -x -b 'o=Iddover,c=Net' '(uid=aitiddnet)' But this seconf ldap serch don't work # ldapsearch -h localhost -x -b 'o=Iddover,c=Net' '(uidNumber=546)' I really don't undertand. In another server with CentOS release 5.6 (Final), openldap-servers-2.3.43-12.el5_6.7 and the same database it works well... # ldapsearch -h localhost -x -b 'o=Iddover,c=Net' '(uidNumber=546)' # extended LDIF # # LDAPv3 # base <o=Iddover,c=Net> with scope subtree # filter: (uidNumber=546) # requesting: ALL # # search result search: 2 result: 0 Success # numResponses: 1 [root@r300te1 ~]# ldapsearch -h 172.16.6.1 -x -b 'o=Iddover,c=Net' '(uidNumber=546)' # extended LDIF # # LDAPv3 # base <o=Iddover,c=Net> with scope subtree # filter: (uidNumber=546) # requesting: ALL # # aitiddnet, People, Iddover, Net dn: uid=aitiddnet,ou=People,o=Iddover,c=Net uid: aitiddnet cn: Aitor Garcia Ortega - Iddover.net objectClass: account objectClass: posixAccount objectClass: top objectClass: shadowAccount objectClass: inetLocalMailRecipient userPassword:: ***************** shadowLastChange: 14363 shadowMax: 99999