Can anybody help please.

We are setting up SBS and are having problems (I bet that is a surprise).

When we VPN into the server from remote locations we get 'disconnected'
after varying amounts of time.

We were testing 3 different laptops:
1 using a telephone line, and the other 2 from another office behind a
simple router.

We 'usually' get in ok (why not every time?), but then the laptops seem to
get disconnected (from the VPN only) after varying times of between 2 and 15
minutes.

Any ideas ?

Thanks

Robert