Are you able to access any other devices on the remote network through your VPN connection, i.e.;desktop, internal websites, etc?
If not, it could be a matter of the device handling the VPN connections not being configured correctly for NAT
From: "rob@xxxxxxxxx" <rob@xxxxxxxxx>
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Sent: Sunday, December 15, 2013 6:16 PM
Subject: RE: VPN & Client Access
If your VPN never resolves the DNS correctly then get a different VPN.
If ipconfig /flushdns doesn't work then try going into Services and
stop/start the DNS client.