This is another bug exists in 1.2.10.12, but not exists in 1.2.11.14 enable cn=attribute uniqueness,cn=plugins,cn=config with the default attribute: uid copy and create cn=attribute test uniqueness,cn=plugins,cn=config with another attribute, for example: sn, just for testing purpose. After restart, try to change a user's rdn: uid, you will get the following error: Another entry with the same attribute value already exists (attribute: "sn") dn: cn=attribute test uniqueness,cn=plugins,cn=config objectClass: top objectClass: nsSlapdPlugin objectClass: extensibleObject cn: attribute test uniqueness nsslapd-pluginPath: libattr-unique-plugin nsslapd-pluginInitfunc: NSUniqueAttr_Init nsslapd-pluginType: preoperation nsslapd-pluginEnabled: on nsslapd-pluginarg0: sn nsslapd-pluginarg1: dc=example,dc=com nsslapd-plugin-depends-on-type: database nsslapd-pluginId: NSUniqueAttr nsslapd-pluginVersion: 1.2.10.12 nsslapd-pluginVendor: 389 Project nsslapd-pluginDescription: Enforce unique attribute values modifiersName: uid=admin,ou=Administrators,ou=TopologyManagement,o=NetscapeRoo t modifyTimestamp: 20130123180354Z dn: cn=attribute uniqueness,cn=plugins,cn=config objectClass: top objectClass: nsSlapdPlugin objectClass: extensibleObject cn: attribute uniqueness nsslapd-pluginPath: libattr-unique-plugin nsslapd-pluginInitfunc: NSUniqueAttr_Init nsslapd-pluginType: preoperation nsslapd-pluginEnabled: on nsslapd-pluginarg0: uid nsslapd-pluginarg1: dc=example,dc=com nsslapd-plugin-depends-on-type: database nsslapd-pluginId: NSUniqueAttr nsslapd-pluginVersion: 1.2.10.12 nsslapd-pluginVendor: 389 Project nsslapd-pluginDescription: Enforce unique attribute values modifiersName: uid=admin,ou=Administrators,ou=TopologyManagement,o=NetscapeRoo t modifyTimestamp: 20130123180354Z -- 389 users mailing list 389-users@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/389-users