Have you configured kerberos krb5.conf file ? That is have you simply copy it to /etc/ from /your_samba_profile/private after Samba4 provisioning ?
I have successfully worked Samba4 beta5 as basis for Openchange and as fileserver on Ubuntu Server 12.04 TLS with Bind9.8 and my LAN clients has good name resolving as within local names as with DNS forwarding. -- users@sogo.nu https://inverse.ca/sogo/lists
