How to Disable Telnet
Telnet sends clear text passwords and usernames through logins and should be disabled on all web servers and replaced with SSH.
1. Login to your server through SSH and su to root.
2. Type pico /etc/xinetd.d/telnet
3. Look for the line: disable = no and replace with disable = yes
4. Now restart the inetd service: /etc/rc.d/init.d/xinetd restart
5. Turn off it through chkconfig as well because it can still start through that.
6. Scan your server to ensure port 23 is closed.
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