I use VPN Client 3.8.7 on XP Professional SP1 in junction with NCF and
VASCO Token. The VPN Client 3.8.9 from SP3 has the sam problem.
If the VPN Connection is disconnected then also the Dial-up connection is
closed. But the Dial-up Profile will not be complete deleted.
IPCONFIG show the following screen:


at the next connection establishment a new profil is created. But the VPN
Client will apparently use the old fragment Profile. And .. no VPN
connection is possible. The Gateway Server is not be found.

Only a reboot will correct the prblem.
After a new XP installation it will work fine for a few times. But then...