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Disable direct root login in CentOS 6.
1. Login first to your machine as a ‘root’ user. 2. Edit the config below. vi /etc/ssh/sshd_config 3. Uncomment the line below and change ‘yes’ to ‘no’. PermitRootLogin no 4. Save and exit the restart the ssh service. /etc/rc.d/init.d/sshd restart