for the telnet server, to disable root access, normally people just remove everything under /etc/securetty that root doesnt have access, and for ssh server, just edit /etc/ssh/sshd_config file, and change this line "PermitRootLogin Yes" to "PermitRootLogin no"
thats it, and dont forget to restart sshd service by doing "/etc/rc.d/init.d/sshd restart", dont worry, your current session wont lost because of restarting the ssh server.
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