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