Please refer the following steps to install CSF firewall on your server:

1.  SSH into your dedicated or cloud server

2.  Download CSF from “http://www.configserver.com/free/csf.tgz”

# wget http://www.configserver.com/free/csf.tgz

3.  You must now extract the downloaded file

# tar -xzf csf.tgz

4.  After the extraction, you must proceed with installing csf using the following command

# cd csf

# sh install.sh

You can check it under the WHM’s menu >> Plugins >> ConfigServer Security&Firewall.