After the Windows Update April 2018, some users are complaining that they are facing VPN error 812.This error is not common, unlike other VPN errors. When you get VPN Aug 23, 2019 · What is VPN Error 812?. While it is not usual to come across VPN Error 812 , there is a simple way to get it resolved so don’t be alarmed if you experience it. Oct 12, 2016 · So I'm thinking you're also correct that there was no connection to clearing that setting and the user account becoming functional again. This leaves me with mysteries: I still don't know if NPS uses LogonHours to restrict access for policy violations? I don't know why the account was getting the 812 error? These notes have been tested with clients running Windows 7 and with a VPN server on Windows 2003 Server, and they may also apply to other versions of Windows.

Generally, error 812 may occur when VPN client couldn't match NPS policies or the user account isn't allowed to connect, or the authenticate method used on client is not same with it configured on server.

Jan 22, 2019 · In most cases, the reason is that MS-CHAP is no longer available in Windows Vista and later versions of the operating system. Thus, Error 812 takes place when the authentication protocol of the VPN server is set to “MS-CHAP” and you are using Windows Vista and above to access the client. Aug 17, 2018 · (Error 812) 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.

From your description and comment i assume its a Point-To-Site connection. If that is the case then the issue is with certificate used for VPN connection, either on the VPN Gateway or on your laptop. To make is simple the certificate has either expire or they don't match. Review the process:

Hidden page that shows all messages in a thread Select Custom Configuration and ONLY select VPN Access and follow the rest of the wizard. Once the wizard completes, leave the server and go to the client. Create a new VPN connection to the server on the Vista Client using the default settings provided during the wizard. Voila, it should connect without complaining about misconfigurations. Oct 10, 2019 · A connection between your computer and the VPN server has been started, but the VPN connection cannot be completed. The most common cause for this is that at least one Internet device (for example, a firewall or a router) between your computer and the VPN server is not configured to allow Generic Routing Encapsulation (GRE) protocol packets.