چگونگی غیر فعال کردن telnet در سرور های رد هت
Deactivating Telnet on a Red Hat Linux server
A system administrator or webmaster should always consider SSH over TELNET when it comes to remotely accessing a server over the Internet. The inherent data encryption features of SSH and the current widespread availability of SSH clients for both Linux and Windows are advantages that Telnet has not to offer.
If you do decide to deactivate an active TELNET server on Red Hat Linux, then you need to use the chkconfig command as described in our example below. The following steps assume that you have SSH already installed and configured on your server.
Logon to your server via SSH and switch to the root user. Then execute the following command to deactivate Telnet:
chkconfig telnet off
Telnet has now been turned off on your server.
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