For security reason, we’d better disable the root SSH access to server. Follow the steps below. (root privilege is needed)

1. Edit the SSH config file

• Ubuntu – vi /etc/ssh/sshd_config
• Fedora – vi /etc/sshd/sshd_config

2. Set the PermitRootLogin to no

PermitRootLogin no

3. Restart the SSH service

• Ubuntu – /etc/init.d/ssh restart
• Fedora – /etc/init.d/sshd restart

Done =)

Reference: Security Tip: Disable Root SSH Login on Linux