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Disable telnet on my dedicated server

Question:

Disable telnet on my dedicated server

I don't know how to disable telnet on my dedicated server. Please advise.

Answer: Disable telnet on my dedicated server

Disable telnet on a dedicated server

For security reason, it's highly recommended to disable Telnet on your dedicated server.
In fact, Telnet is not secure because password, username and other info sent are not crypted.
So Telnet should be disabled on your dedicated server and replace with SSH. Telnet uses
the port 23 for incomming and outgoing messages.

Dissable Telnet step by step:

On Linux RedHat Distribution:

1) Log in on your server through SSH
2) Type: su root
3) Edit the telnet file: "pico /etc/xinetd.d/telnet"
4) Search the line: "disable = no" and change it with "disable = yes"
5) Restart Xinet service
6) Restart the xinet service: "/etc/rc.d/init.d/xinetd restart"
7) Disable Telnet on the boot with chkconfig: "/sbin/chkconfig telnet off"
8) Test if Telnet is successful disabled: " ps -aux | grep telnet". It should be empty!
9) verify the port 23 is closed with "nmap -sT -O localhost"

On Linux CentOS Distribution:

1) Log in on your server through SSH
2) Type: su root
3) Edit the telnet file: "pico /etc/xinetd.d/krb5-telnet"
4) Search the line: "disable = no" and change it with "disable = yes"
5) Restart Xinet service
6) Restart the xinet service: "/etc/rc.d/init.d/xinetd restart"
7) Disable Telnet on the boot with chkconfig: "/sbin/chkconfig telnet off"
8) Test if Telnet is successful disabled: " ps -aux | grep telnet". It should be empty!
9) verify the port 23 is closed with "nmap -sT -O localhost"

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