I have 3 sites;
Site A has sbs2011 server, 2003 Server, subnet x.x.20.x
Site B has Server 2003 server, subnet x.x.10.x
Site C has no server, subnet x.x.30.x
Site A & B are connected by VPN - Mutitech routers.
Site B & C are connected by VPN (site C has a D-Link Router)
Site A & C are connected by VPN
All servers have DNS enabled.
From PC at Site C, using nslookup, I can resolve names from DNS server in Site B, however if I use the DNS servers in site A, DNS resolution fails (times out). I can ping the all servers by IP address and as the PC has its primary DNS server in site B, can ping all servers by name and name.domain.lan.
At site C the D-Link router gives out IP address and the domain suffix for the domain.
The PC's are Domain Joined.
Also, on the site C PC, I can not get to http:\\companyweb
(hosted on the SBS Server in site A), however can get to https:\\sbs\owa
(RWW site). Nor can I get to or view any server shares off the servers in Site A, although I can get to server shares in site C.
As far as I can tell the VPN configuration between Site C & A (link with issues) is the same as the VPN configuration between site C & B. (Also there are not a lot of options on these lower end routers to limit traffic)
The AD configeration has two sites configured Site A & Site B. All funtionallity is avaible between site A & B.
I am suspecting it is a security issue on the SBS server (recently added to the network), as the VPN configuration look the same and there is full functionality between site C & B.
Any help with this would be appreciated.