I'm trying to modify uid with ldapmodify. This is my modify.ldif: ###---modify.ldif---### dn: uid=old_user_uid,dc=dominio changetype: modify replace: uid uid: new_user_uid $ldapmodify -x -D "cn=admin,dc=dominio" -W -f modify.ldif Enter LDAP Password: modifying entry "uid=old_user_uid,dc=dominio" ldap_modify: Naming violation (64) additional info: value of naming attribute 'uid' is not present in entry When I try to modify dn: ###---modify.ldif---### dn: uid=old_user_uid,dc=dominio changetype: modify replace: dn dn: uid=new_user_uid,dc=dominio $ldapmodify -x -D "cn=admin,dc=dominio" -W -f modify.ldif Enter LDAP Password: modifying entry "uid=old_user_uid,dc=dominio" ldap_modify: Undefined attribute type (17) additional info: dn: attribute type undefined I've seen RFC2849, and the examples have dn and uid fields like: dn: cn=Gern Jensen, ou=Product Testing, dc=airius, dc=com objectclass: top objectclass: person objectclass: organizationalPerson cn: Gern Jensen cn: Gern O Jensen sn: Jensen uid: gernj Here is the output of #slapcat -a uid=old_user_uid dn: uid=old_user_uid,dc=dominio uid: old_user_uid cn: SomeOne homeDirectory: /home/old_user_uid uidNumber: SomeNumber objectClass: posixAccount objectClass: shadowAccount objectClass: person objectClass: inetOrgPerson gidNumber: SomeNumber sn: Someone shadowExpire: 14245 loginShell: /bin/bash userPassword:: NWh0c0p0T3g= shadowLastChange: 14193 structuralObjectClass: inetOrgPerson entryUUID: 9a2b0c7a-488e-102d-8bce-7f1d632647aa creatorsName: cn=admin,dc=dominio createTimestamp: 20081117005833Z entryCSN: 20081117013513Z#000000#00#000000 modifiersName: cn=admin,dc=dominio modifyTimestamp: 20081117013513Z