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You can establish the VPN using XP but Vista

  • 732 Your computer and the remote computer could not agree on PPP control protocols.
  • 718 The connection timed out waiting for a valid response from the remote computer
  • 734 The PPP link control protocol was terminated
  • 736 The remote computer terminated the control protocol
  • 919 The connection could not be established because the authentication protocol used by the RAS/VPN server to verify your username and password could not be matched with the settings in your connection profile

Situation: If you can establish the VPN using XP but Vista, it could be the MS-CHAP issue.

If the Vista VPN receives these error codes, It could be the MS-CHAP issue.

  • 732 Your computer and the remote computer could not agree on PPP control protocols.
  • 718 The connection timed out waiting for a valis response from the remote computer
  • 734 The PPP link control protocol was terminated
  • 736 The remote computer terminated the control protocol
  • 919 The connection could not be established because the authentication protocol used by the RAS/VPN server to verify your username and password could not be matched with the settings in your connection profile

By default, Windows Vista uses to MS-CHAPv2.  If your server is configured to accept connections only using MS-CHAPv1 as the authentication method, then Windows Vista clients will be unable to connect to your server.

Resolutions:

1. Configure the VPN server to allow clients to connect with MS-CHAPv2 as the authentication method. 

2. How to disable PAP, CHAP and MS-CHAP v2
http://www.chicagotech.net/netforums/viewtopic.php?t=1697

Also refer to this link: How to check Windows VPN server running MS-CHAPv2

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