Cannot resolve DNS through a site to site VPN using a tz210 at the main site and a tz190 a the remote site.

I have a windows2008 server at the main site with a tz210 and at the remote site I have a tz190, both running the enhanced OS.  The main site ports seem to be open but the remote site is not.  I did all the same configuration I did with the tz210, I do have VPN setup betwee the site also.  Firewall is pretty much off on both devices, I turned the firewall and the service off on the computer and still when I try to join the domain from the remote to the main office it cannot fine the server.  When I search the server by its ip address it opens up but when I use the \\name it cant find it.  How can I get the routers to allow resolving of the DNS on and stay on, also how can I these routers to port forward wtihout having issues.  I even turned on IP helper on the routers and still nothing.  HELP..........