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The telnet is insecure and unencrypted protocol. The use of this unencrypted protocol could allow users to sniff network traffic and to steal sensitive information like username and password.
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1. Login to the server through SSH and su to root. 2. Edit /etc/xinetd.d/telnet by typing vi /etc/xinetd.d/telnet 3. Search for the line: disable = no and replace with disable = yes 4. Save /etc/xinetd.d/telnet and exit 5. Restart the inetd service: /etc/rc.d/init.d/xinetd restart 6. Also turn off telnet through: /sbin/chkconfig telnet off
URL: http://www.itsecuritycenter.com/disabling-telnet-in-linux.html
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