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Avoid Using Non-Secure Software

Most network configuration, usernames, passwords, unsecure protocol like FTP, telnet and rsh commands, data can be captured by anyone on the same network using a packet sniffer.

To avoid this, you need to remove these unsecure software by running this command:

sudo apt-get purge xinetd nis yp-tools tftpd atftpd tftpd-hpa telnetd rsh-server rsh-redone-server