"dn: cn=admin,cn=config" adding problem

Hello.

Our slapd listens on outer interfaces and i want to create an access rule for rootdn to allow admin access only from 127.0.0.1 ip. So, i try to add "dn: cn=admin,cn=config" record to config database:

~# cat admin.ldif dn: cn=admin,cn=config objectClass: person cn: admin sn: admin userPassword: 1

~# ldapadd -xWD 'cn=admin,cn=config' -f admin.ldif Enter LDAP Password: adding new entry "cn=admin,cn=config" ldap_add: Object class violation (65)

I got no extra info, just this. According to core.schema mandatory fields are only cn and sn. So, i don't understand why i see this error. Can anybody help me?

Thanks.