[Users] engine-manage-domains can't add user , domain

I use FreeIPA to authenticate users, ipa user-add has no problem, but when i do : [root@ovirt-engine ~]# engine-manage-domains -action=add -domain='local' -user='tsinjon' -interactive Error: Authentication Failed. Please verify the fully qualified domain name that is used for authentication is correct.. Problematic domain is: local Failure while applying Kerberos configuration. Details: Authentication Failed. Please verify the fully qualified domain name that is used for authentication is correct. and log from engine-manage-domains.log : 2012-05-14 21:58:47,892 INFO [org.ovirt.engine.core.utils.kerberos.ManageDomains] Creating kerberos configuration for domain(s): local 2012-05-14 21:58:47,923 ERROR [org.ovirt.engine.core.dns.DnsSRVLocator] Error in getting SRV list for protocol _tcp and domain LOCAL Exception message is DNS name not found [response code 3] my domain is 'local' , like ovirt-engine.local 、ovirt-node-1.local …etc What can i do to get through it?