root@reception:~/bind9-ldap# ./ldap2zone -D "uid=admin-read-only,ou=people,dc=irregular,dc=at" -w secret irregular.local ldap://localhost/dc=irregular,dc=at 500

ldap_simple_bind_s
ldap_simple_bind_s: Protocol error (2)
	additional info: historical protocol version requested, use LDAPv3 instead