14.2.3. Requiring SSH for Remote Connections

For SSH to be truly effective, using insecure connection protocols should be prohibited. Otherwise, a user's password may be protected using SSH for one session, only to be captured later while logging in using Telnet. Some services to disable include telnet, rsh, rlogin, and vsftpd.

To disable these services, type the following commands at a shell prompt:

chkconfig telnet off
chkconfig rsh off
chkconfig rlogin off
chkconfig vsftpd off

~]# chkconfig telnet off
~]# chkconfig rsh off
~]# chkconfig rlogin off
~]# chkconfig vsftpd off

For more information on runlevels and configuring services in general, see Chapter 12, Services and Daemons.