When deploying a Windows Server 2019 Network Policy Server (NPS) to support a Windows 10 Always On VPN implementation, administrators may encounter the following error when attempting to establish a VPN connection on a remote Windows 10 client.
Can’t connect to [connection name].
The connection was prevented because of a policy configured on your RAS/VPN server. Specifically, the authentication method used by the server to verify your username and password may not match the authentication method configured in your connection profile. Please contact the Administrator of the RAS server and notify them of this error.
In addition, an event ID 20227 from the RasClient will be recorded in the application event log with the following error message.
The user [username] dialed a connection named [connection name] which has failed. The error code returned on failure is 812.
Always On VPN error code 812 indicates an authentication policy mismatch…
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