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The root account is often the most targeted account by crackers via SSH under Linux. An enabled SSH root account on a Linux server exposed to a network or, worse, exposed in Internet can pose a high degree of security concern by system administrators.

The SSH root account should be disabled in all cases in Linux in order to harden your server security. You should login via SSH on a remote server only with a normal user account and, then, change privileges to root account via sudo or su command.