I recently setup a new domain (moving from company.local on 2008 R2 servers to corp.company.com on 2012 servers). There are a lot of minor errors in different places, but overall the servers and local clients are "working."
One of the biggest issues I'm having is with using RDC to connect to the servers. When I am locally connected to the network, I can RDP into all of the servers with no problem. When I am away from the network and I connect over VPN, I am unable to RDP into some of the servers. There are a few servers that I can connect to just fine. I can RDP into the RDS server, SQL server, file server, and one workstation. I am unable to RDP into the Hyper-V server, DNS server, DHCP server, Exchange server, and the other 3 workstations I have setup in this environment. I have tried pinging the servers and workstations and it times out on the machines that I'm unable to connect to.
I am currently using a SonicWALL TZ 215w to VPN into the network. I tried opening the RD ports on the problematic servers, but it did not fix anything. I have also tried disabling the Windows Firewall altogether, yet the issue persists.