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How to Install CSF (ConfigServer Firewall)

ConfigServer Firewall (or CSF) is a free and advanced firewall available for most Linux distributions. In addition to the basic functionality of a firewall – filtering packets – CSF includes other security features, such as login/intrusion/flood detections. CSF also includes UI integration for cPanel, DirectAdmin, and Webmin.


Installing ConfigServer Firewall (CSF)

To install CSF onto your Linux distribution, just follow these 5 easy steps:

  1. First, in order to install CSF, you must log in to your server with root user

  2. Next, download the CSF installation pack using the following command:
    wget https://www.configserver.com/free/csf.tgz
      Command line showing the wget https://www.configserver.com/free/csf.tgz used to install csf

  3. The downloaded file is a compressed form of a tar package, and has to be uncompressed and extracted before it can be used. To extract the file, use the following command and hit enter.
    tar -xzf csf.tgz
    Command line showing the tar -xzf csf.tgz command used to unpack CSF

  1. Now it is time to execute the CSF’s installer script. Move to the csf directory (by using: cd csf) and execute the following installation script:
    sh install.sh
    Command line showing the sh install.sh command, used to install CSF

  1. The firewall is now installed. Next, you should check if the required iptables modules are available. You can check for the iptables modules using the command:
    perl /usr/local/csf/bin/csftest.pl
    Command line showing the perl /usr/local/csf/bin/csftest.pl command used to check iptables modules
    If no fatal errors are reported, then the firewall should be working correctly.

And there you have it! If you have WHM installed on your server, you can double-check that CSF is working properly by checking under WHM’s menu >> Plugins >> ConfigServer Security&Firewall.


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