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Configuring Root Logins
If you want to give someone permission to login directly to the root login account via Secure Shell, you can define three methods of control with the PermitRootLogin configuration parameter in the sshd2_config file:
The default value yes enables root logins with any authentication method:
Use the value no to disable all logins with root privileges:
With the value nopwd root logins are allowed only when an authentication method other than password is used: