VPN error 691when connecting from Windows

Hi, Everything was working find until i update to 4.0(with a clean installation)

When i connect to VPN via iOS devices or MAC, everything works fine but when i try connecting from a Windows PC, error 691 always come up. I tried every setting possible on the windows side... I'm sure my password are OK because everything works fine on MAC and iOS and it's also my email password...

Anything you can think i can try?

I've been connecting to VPN with windows for a long time now..

Thanks!