DialUp:Error 691:Access Denied Because Username / Password
You receive the "Error 651" error message when you try to This problem occurs because the Layer 2 Tunneling Protocol (L2TP) tries to create a host route and then detects that the route to the host that was created by the dial-up connection already exists. FIX: VPN Error 691 on Windows 7/8 and 10 - Appuals.com Mar 15, 2018
Error 651 - Sprint Community
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DialUp:Error 691:Access Denied Because Username / Password Nov 04, 2010 Connection Failed With Error 651: What It Is and How to Fix It