Accessing Navision over VPN


We have a Dos version (sorry, don’t have version #). It’s running on a sbs2003 server.

I am running a custom build i5 with Win 7 x64, but I can’t make Navision run over VPN. I do get on the server and get a local IP, but everytime I try to start Navision over PPTP VPN, the window show up for a few second, and ends in a Dos commandoprompt with the error message:

The requested name is valid, but no data of the requested type was found.

I know it can be done, the boss does it from XP. But what am I missing? My hosts file is identical to his. Nada.