(The management process of broadband connection error 691 (access is denied because the user name or password on the domain is invalid) / error 635 (does not recognize the error) is as follows: (1) The user name and password are incorrectly filled in (2) Assuming that the user account password is filled in correctly, then Go to the next step to continue the management; it is recommended to rebuild the dial-up software (if you don't know how to install the dial-up software, you can refer to the user from scratch))