I had a problem with a VPN connection on my Vista laptop and couldn't figure it out for a while because I knew everything was set up correctly. Then I found MS KB 953795, which I've expanded on here,
http://techierambles.blogspot.com/20...n-windows.html. That solved my problem. Anytime I tried to connect it would fail immediately, and it turned out it was because of some corruption in the PPTP and L2TP built-in VPN files on the laptop. The main thing to watch is where the connection attempt fails. If it happens right away, it's possible that you had the same problem I did, but there are a lot of other possibilities too such as a misconfigured connection. If the status changes to verifying username/password, then you know there is connectivity. If it fails after that point, it's most likely just an incorrect username or password. Once it gets past the verification stage you shouldn't have any other problems.
*Note, I strictly have dealt with PPTP user VPNs. I have experience with IPSec and L2TP only through IPSec tunneling for site-to-site connections, not for end users. If you're connecting to an IPSec VPN then I have no idea if anything I said is going to help. Good luck either way
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