Hi,
Not so easy just one week before... It's almost impossible without having your network topology, your installation log/details, the network configuration, etc.
Some of questions you may ask yourself :
- what kind of NAV logins are you using ? msdn.microsoft.com/.../hh169371(v=nav.71).aspx
- do you have an existing VPN ?
- does-it support Active Directory Authentication outside of your network ?
- How your Nav Server (NST) is reachable from outside ?
- etc.
Regards.