ConfigServer & Security Firewall (CSF) is getting more popularity for cPanel servers security. It prevents your server from DDOS attacks. Now let's see how to install and configure CSF firewall on cPanel servers.


Step 1 – Install CSF Firewall


First download latest source code of CSF firewall and extract on your system using following commands.

tar xfz csf.tgz
cd csf


After extracting latest code from your system. Execute script to install CSF on your system. The installer will automatically detect for cPanel server and install required modules for it.



Step 2 – Configure CSF Firewall


Now edit /etc/csf/csf.conf configuration file and disable TESTING mode by setting value to “0”.



Let’s restart csf service

csf -r


Now you can visit to WHM interface Home » Plugins » ConfigServer Security & Firewall to access CSF graphical interface for more configuration options.


Step 3 – Manage CSF with Command Line


We can also manage CSF firewall using command line. For example below is some


To allow an IP. Ip will be added to /etc/csf/csf.allow

csf -a             
csf --add             


To deny an IP. Ip will be added to /etc/csf/csf.deny

csf -d             
csf --deny             


To search for specific IP, CIDR in iptables rules.

csf -g             
csf --grep             


Start the firewall rules

csf -s
csf --start


Flush/Stop firewall rules (Note: lfd may restart csf)

csf -f
csf --stop


Restart CSF firewall rules

csf -r
csf --restart


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