After installing Windows 8 RTM, I tried to setup a VPN connection as usual. On Windows 7 it was really trivial, it didn’t ask anything beside the VPN server address and the login credentials. However on Winodws 8 I got the following error message:
The connection could not be established because the authentication method used by your connection profile is not permitted for use by an access policy configured on the RAS/VPN server. Specifically, this could be due to configuration differences between the authentication method selected on the RAS/VPN server and the access policy configured for it.
You can find the problem on the Security tab of the VPN connection Properties window. By default none of the Authentication radio button are selected:
The solution: explicitly select an authentication method. Thank God, it doesn’t work without it