Problems with connecting to UNC path through Site-to-Site VPN

I setup a Site-to-Site VPN using two SonicWall TZ 105.  I can ping through each router from either side.  The problem comes on the remote side when I try to logon a new user and log them onto a system that they never used, I get an error stating “no logon servers available to service the logon request”.  If a Domain user already exists on the system I can log that person on but the mapped drives will not connect.  If I try to connect to the server using UNC \\ServerName I get a window asking me to enter a network password and a warning "The system detected a possible attempt to compromise security.  Please ensure that you can contact the server that authenticated you."

Security Warning
 If I use the IP of the server \\ then a list of mapped drives appear and you can browse them.

I have enabled NetBIOS over VPN in both routers and NetBIOS over TCP/IP on the server and the workstation, but the results are the same.
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BasheerptConnect With a Mentor Commented:
It seems the DNS traffic is blocked. Check the router/firewall.
This error message normally appears when Kerberos is having issues.

A couple of quick things to check:
Servers/clients have the correct time set
Both TCP88 and UDP88 ports are enabled over the site-to-site VPN
TechAKAuthor Commented:
Nothing worked
TechAKConnect With a Mentor Author Commented:
I ended up putting the Domain DNS server in DHCP on the remote router as the first DNS server leaving the ISPs DNS servers as secondary server allowing logon users to query the Domain DNS if the tunnel was up.
TechAKAuthor Commented:
Combined with Basheerpt it worked
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