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..........
PowerC280Asked:
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Aaron TomoskySD-WAN SimplifiedCommented:
Ip helper is usually the trick. Did you enable it for netbios and make it reflexive?
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PowerC280Author Commented:
Where is the reflexive?
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PowerC280Author Commented:
I don't get this, one minute I can use (\\domain) the next I can't.  ISP is not blocking anything, I need these ports to stay open at all times.  What must I do?
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Aaron TomoskySD-WAN SimplifiedCommented:
Reflexive means both ways. So a rule from Tunnel to lan and LAN to tunnel
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royitCommented:
Make sure you can reach DNS server, if so por 53 opened, if so netbios opened, if so FQDN defined.
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PowerC280Author Commented:
Come to find out, it was the IP helper that did the job.
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PowerC280Author Commented:
It was the IP Helper that did the job.  I did not have to setup reflexive.
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Aaron TomoskySD-WAN SimplifiedCommented:
Awesome. It's still a magic little setting for me but it seems to do the trick
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PowerC280Author Commented:
SomethIng so simple....thanks
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