Hi Akihiro, Akihiro Moriguchi wrote: > cn={3}inetorgperson,cn=schema,cn=config: olcAttributeTypes: Duplicate > attributeType: "2.16.840.1.113730.3.1.1" Sounds to me like you have two schema files which each define the same attribute (in this case, carLicense). Try identifying them with something like: grep -r 2.16.840.1.113730.3.1.1 /etc/ldap/slapd.d Respectfully, Ryan