Error 766 - A certificate could not be found
"Error 766: A certificate could not be found. Connections that use the L2TP
protocol over IPSec require the installation of a machine certificate, also
known as a computer certificate."
"Error 766: The L2TP connection attempt failed because the security layer
could not authenticate the remote computer."
Cause: Connections that use the L2TP protocol over IPSec require the
installation of a machine certificate, also known as a computer certificate.
You will see this error message when such a certificate is not available.
Typically, this error is generated on a remote access server that has active
L2TP ports configured, the remote access service started but there is no
certificate in the computer certificate store. This generates an event log
message that tells the administrator that L2TP ports will not be able to
accept calls until a certificate is acquired and RRAS is restarted.
Resolutions: 1. If you use PPTP VPN, select Automatic in Type of VPN.
2. If you use L2TP, check the remote access server and make sure there is
certificate in the computer certificate store.
VPN error codeVPN Error 720 - the connection attempt failed because your
computer and the remote computer could not agree on PPP control protocol -
Case 2 ...
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