Nowadays, Telnet is mostly given its role to SSH; more secure remote shell client, because Telnet is sending the passwords in readable clear text. Also SSH have many abilities that you can use such as private-keys that you can use to log in to the server without writing down a password. Public key is mostly used when you need root access even you don't know the root password (root password might be changed by the system administrator or by your client which you install the system for).

Connect to the server and edit /etc/xinetd.d/telnet :

if exists disable = no change to disable = yes

save & exit (SHIFT + ZZ)

WARNING: This document is prepared for CentOS5.5 but expected to be compatible with other versions and differs some commands or command paths. Please, check the used services before applying these steps.

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