Why Does My Login Fail After I Enable 2FA?

The login failed probably because file configurations or the login mode was incorrect.

Configuration file path: /etc/ssh/sshd_config

Configuration items:

PermitEmptyPasswords no

UsePAM yes

ChallengeResponseAuthentication yes

If you use the root account for login,the following configuration item is required:

PermitRootLogin yes

• Used CloudShell to log in to an ECS.
• Attempted to log in to a Linux server through a CBH instance.

Failure cause: 2FA is implemented through a built-in module, which cannot be displayed if you log in in the preceding ways. As a result, the login authentication fails.

Solution: Perform login authentication by referring to How Do I Use 2FA?

For details about the prerequisites, restrictions, and limitations for enabling 2FA, see "Enabling 2FA" in Security Configuration.