The Error 691 occurs when the settings are incorrect on one of the devices (client or the server) and it cannot ensure authenticity of the connection. The most common cause is an incorrect username or password, it may also be the case if you are using a Public VPN and your access has been revoked, you’re attempting to login to the VPN with a domain that isn’t allowed, or domains are not allowed at all, OR the security protocols needed for the handshake do not match.
There are three methods in total, this is one of them. If this doesn't resolve the issue, then try the other methods at http://appuals.com/vpn-error-691-on-windows-78-and-10/
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