Configuring Root Logins
If you want to permit someone to login directly to the root login
account via ssh, you can define three methods of control in the
sshd2_config file:
PermitRootLogin no
This will disable all root logins. To enable root logins with any
authentication method, use the following setting:
PermitRootLogin yes
You can limit the authentication methods by using the following setting:
PermitRootLogin nopwd
This allows root logins only when an authentication method
other than password is used.
It is also possible to create a separate subconfiguration file for root. See
Section Subconfigurations for more information.