In our small network there is a Windows 2008 R2 Domain Controller that also serves as Remote Access Server. For years, we could access this server and the resources in the network over a VPN connection without any problem.
Since some time however, I am able to connect to the VPN, but my Windows 8 client (and another one I used for testing purposes) is not able to connect the domain controller afterwards. I can access any other server in the network, but there seems to be a problem regarding the trust between the client(s) and the server. If I connect the client to the network directly over a LAN cable, everything works as expected. Also I can connect to another server over VPN and open a RDP prompt to the DC without a problem.
On the client, whenever I try to access the DC, I get an access denied message. I've tried to update the group...