1. Turn off NAT on the router (not recommended)
2. Edit your Host file to map the name to the IP Address of your Server or other machine.
The Host file is found in
It can be edited with notepad.
You would add the line (for example):
Where "x" and "y" are the specific numbers for the Server's IP address and "ServerName" is the actual name of your server.
What has happened, is that your VPN connected computer cannot distinguish that "Computer Name" and "IP Address" are one in the same due to NAT limitations.
The Host file is an override that makes the "distinction" for your computer.