This is the documentation for the 22.02 version. Looking for the documentation of the latest version? Have a look here.

Locked out by NACM Rules

If TNSR access is lost due to the NACM configuration, access can be regained by following the directions in Regaining Access if Locked Out by NACM.

How to gain access to the root account

By default, the root account has interactive login disabled, which is the best practice. This can be changed by resetting the root password using sudo from another administrator account, or in the ISO installer. See Default Accounts and Passwords for details.