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Background: All the Windows 7 pro machines can connect to VPN via PPTP or SSTP on a Windows 2008 R2 VPN server fine. But windows 8.1 Pro can't. It generates 720 on the machine and on the server with this error:

port xyz has been disconnected because no network protocols were successfully negotiated.

Things I've tried:

  • Changing settings
  • Re-installing Network drivers
  • Running netsh to reset TCP/IP stack
  • Removing and re installing wan-miniports
  • Turning off firewalls etc
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Look here and see if it helps: superuser.com/questions/525602/… –  TheCleaner May 16 '14 at 19:36

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