Windows 8 VPN 691 connection error Solution

Microsoft has recently released Windows 8 RTM, and many friends have installed it. Of course, I am no exception. In the past few days, many of my friends have asked me that no matter how the VPN connection is, the password is wrong and cannot be verified. So I connected the VPN for a test, as shown below:
After configuring the VPN, do not repeat it. Enter the ID and password when connecting.


Connection. Error 691 is reported ...... So I started searching for problems.


Turn on VPN connection properties to discover that authentication uses scalable Authentication Protocol Security Password EAP-MSCHAP v2, probably because of this.
 
Next, modify the authentication protocol, as shown in.


Connect again and pass verification.