Download the file:

Unpack the archive:

Navigate to the uncompressed csf directory:

Run the installer:

This will create a configuration file and add all required cPanel services to the allow list.

Next, disable testing mode by editing the main CSF configuration file. Open the file using any editor (vi, nano, etc):

Scroll down and find: TESTING = “1” and change to TESTING = “0”

Note: keep the quotations (“”) enclosing the number.

To save, press ‘Ctrl O’.

Hit ‘Enter’ when your screen asks “File Name to Write: /etc/csf/csf.conf”.

Next, hit ‘Ctrl X’ to exit.

When done, restart CSF:

Now CSF is installed and ready. You can simply manage it via cPanel WHM interface WHM > Config Security & Firewall.

OR via command-line:

ALLOW / BLOCK IP with CSF:

In the event that you need to allow/block IP address using command line, the options are as follows:

To add your IP address to a permanent allow list:

To block the IP:

To clear blocked IPs:

Additional Options:

Via Command line you can type: csf -[option]

Commands to Know:

cd = change directory

cd ../ = change up a directory

wget  = fetches a download link

tar  = tar is to uncompress archived files

csf = run commands for the csf firewall followed by an option

ls = list, which shows the contents in the directory you’re in.

pwd = shows the directory you’re currently in.

For more information about CSF, see: http://configserver.com/cp/csf.html

For more information about Basic linux Commands

See: http://www.comptechdoc.org/os/linux/usersguide/linux_ugbasics.html