Connect to VPN:Error 691 - Microsoft® Community
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
Nov 04, 2010
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.
Mar 15, 2018
Error 691 in Windows 7 - Easy Fix For Windows 7 Error 691 Error 691 is a network related error which may appear at the time you are attempting to establish a dial-up connection in Windows 7. We had found that the error was windows 7 vpn error 691 | Tech Blog (Microsoft, Google and 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. Troubleshooting Always On VPN Errors 691 and 812 | Richard