Given the same computer, using iPhone hotspot (off corp network), vpntest cannot connect (691 error) to VPN vpntest2 can connect to VPN. Even newly created users are able to access the VPN. It just seems to be with specific users who have been with the company for a very long time.
Verify that the login ID and password are correct. This may seem like a basic fix but works in most … Windows 8 / 8.1 VPN Error 691 - answers here! TLS-EAP doesn't work, CHAP does work. If you skipped here, don't worry - configure the VPN via the VPN Properties page to allow CHAP, which has been disabled by default in Windows 8 and 8.1 on the two screens shown here: Above, "Use Extensible Authentication Protocol (EAP)" was clicked by default. Error 691 when connecting through VPN on Windows 8 or Jan 22, 2013 VPN Error 691 Solutions | Experts Exchange
How to resolve VPN Error 691 on Windows 10? | The Official
Mar 31, 2016 Fix VPN Error 691 on Windows 10
Solution: A. Verify the logon ID and password are correct. B. Make sure the Include Windows logon domain check box is unchecked in the Options tab of the dial-up connection’s Properties dialog box.
DialUp:Error 691:Access Denied Because Username / Password Nov 04, 2010 How To Fix The 691 Error In Windows XP - The 691 error in Windows XP is a dial-up connection error. It appears when you try to establish a dial-up connection for your network so you can access