[Samba] joined DC but replication fails

[steve]

ubuntu 14.04 DCs

DC1 with fsmo
resolve_lmhosts: Attempting lmhosts lookup for name
51755e44-0a78-4ab8-8206-b4ae8a09c172._msdcs.altea.site<0x20>
dns child failed to find name
'51755e44-0a78-4ab8-8206-b4ae8a09c172._msdcs.altea.site' of type A

DC2
/usr/local/samba/sbin/samba_dnsupdate: update failed: NOTAUTH
resolve_lmhosts: Attempting lmhosts lookup for name
37cb1209-7eef-4671-b38b-2a71c231a40b._msdcs.altea.site<0x20>

What's missing?
Thanks,
Steve