Run This as root in puttty:
Read this for more info:
https://download.configserver.com/csf/install.txt
Code:
cd /usr/src
rm -fv csf.tgz
wget https://download.configserver.com/csf.tgz
tar -xzf csf.tgz
cd csf
sh install.sh
https://download.configserver.com/csf/install.txt