VPN Connection via PPTP ERROR:720

[massaslayer]

Hello Windows 8 Folks,

I got some problems with Windows 8 Pro and VPN Connection with the PPTP Protocol.

1) The error:
http://i45.tinypic.com/8ye1pi.png

2) My settings are standard except for this:
http://i50.tinypic.com/2zg6a2t.png
http://i49.tinypic.com/2w526aa.png

3) My network devices
http://i46.tinypic.com/5pop05.png

4) My 2 error logs I receive
CoId={C13B87ED-F08A-4A3A-87D5-3AD4A5FEE7F3}:The initial Secure Socket Tunneling Protocol request could not be successfully sent to the server. This can be due to network connectivity issues or certificate (trust) issues. The detailed error message is provided below. Correct the problem and try again.

A certificate chain processed, but terminated in a root certificate which is not trusted by the trust provider.

__________________________________________________ __________________________________

CoId={C13B87ED-F08A-4A3A-87D5-3AD4A5FEE7F3}: The user SYSTEM dialed a connection named VPN Connection which has failed. The error code returned on failure is 720.


4.1) I Tried testing the connection manually

SSTP Received the following error:
http://i49.tinypic.com/2i1fc60.png

And IKEv2 this one:
http://i47.tinypic.com/nyg3a0.png

At the others I have Received the same error as described above.


5) Things I tried before, did not do anything:
Windows 8 VPN not working - error 720

Just an IT nublet: Solving PPTP VPN Error: 720 on Windows 7

Windows 8 Pro VPN Connection problem - No network access

PPTP VPN on Windows 7 - error 720


6) Other information:
Notebook: HP Elitebook 8740w with official Windows 8 Pro.
Windows Firewall Disabled
Windows Defender Disabled
During testing I removed AVG, it did not help anything.

7) Other information
I used the same credentials with Windows 7 & Vista and it worked instantly.

I would really appreciate your help in this mather.
Me and my colleagues will thank you!

Kind regards,
-Vincent