Within the Microsoft Environment, Remote VPN Client Computers do not register themselves within DNS. Additionally, DHCP entries are attributed to “RAS” rather than the host name of the clients.
This means that remotely administering a VPN Client machine using the Host Name isn’t going to be possible. However, I did have some success using the IP Address of the Client.
So, how do we find the IP Address of the Remote Client?
You can find a list of currently connected “Remote Access Clients” within the “Routing and Remote Access” snap-in
Administrative Tools => Routing and Remote Access => Select Server => Remote Access Clients => Status. Make a note of the IP Address for the Client.
You can then use IP Address (rather than the Host Name) to connect to the Client with the usual Administration Tools.