Hey!
I have a Server 2012R2 with DNS, DHCP and RRAS roles.
When the RRAS - SSTP vpn is configured in NAT, with one nic, the VPN works without any problems. I can access all my internal network resources without any problem.
The problem is that, when the RRAS SSTP vpn with NAT works - it kills the DNS request from internal LAN clients.
Because the server was first setup as DHCP (works!) and then RRAS SSTP vpn, i didnt notice the problem after trying setup DNS server on the same server. Other client on LAN just have dns request timed out.
I´ve tried turning off firewall, same problem.
Tested setting up VPN on the same server with different RRAS options, but every time you can connect to VPN, but no other internal network resources like shares, http/s websites, RDP, ping etc.
The RRAS - SSTP vpn uses static IP pool, from seprate subnet, because DHCP pool doesn not have as many free IP addresses as needed by VPN clients.
The server itself, were DNS, DHCP and RAS is installed, has no probleem with dns resolution. But other clients that use this server as DNS, they cannot get DNS request solved.After stopping RRAS service, DNS starts working.