In this article, we will show you how to install and configure the CSF firewall on a Debian 9 VPS, as well as go through some tips on how to use CSF.
ConfigServer Security & Firewall (CSF) is a free and advanced firewall management tool based on iptables. CSF provides a high level of security on your server and is very straightforward, making it easy to set up and install on all supported Linux distributions. We will use Debian 9 which is among the supported Linux distributions. CSF has many great features such as port scanning, SYN floods and brute force attacks for many services that can help you protect your server. One of the very nice features on CSF is that it provides a built-in web UI for managing the firewall from a web browser. This UI integration is supported by cPanel, DirectAdmin, as well as working independently on your server.
The CSF installation also comes with another service called Login Failure Daemon (LFD). LFD actually is a process that monitors the log files and sends email notifications based on the CSF configuration rules. Let’s begin with the installation.
Elgg is a free and open-source social network platform that allows users to build their own self-hosted social network environments, such as a campus-wide social network for your university, school, or college, or an internal collaborative platform for your organization.
SELinux or Security-Enhanced Linux is a Linux kernel security module which provides a variety of security policies and gives server administrators better control over access to various parts of their system. Basically, with SELinux enabled, every program or action running on a 
Feng Office is an open-source collaboration platform that is web-based and written in PHP. This application has three editions: Community, Professional, and Enterprise. In this tutorial, we will install the Community edition which is the basic Feng Office and includes excellent features such as task management, document management, workspaces, and a lot more.
Microweber is a feature-rich open-source content management system and website builder. It is based on the PHP programming language and the robust Laravel Java framework. Microweber’s drag-and-drop technology and real-time writing and text editing functionality provides a quick and easy way to create your content, helping turn your website into a rich environment for you to express your thoughts. It also comes with built-in storefront features, allowing you to create an e-commerce site from which you can sell your products on the Internet. Let’s begin with the installation.
PhpPgAdmin is an open-source web administration interface used for managing PostgreSQL databases. PhpPgAdmin is written in PHP and it makes the administration of PostgreSQL databases easier, not to mention the web-based GUI making everything more user-friendly and easier to use. Let’s begin with the installation process.
Open eShop is a free and open-source PHP-based web interface that allows its users to easily sell their digital goods such as MP3s, eBooks, Movies, Software, or any other downloadable item on offer. The installation of Open eShop is pretty easy, and this tutorial will go into details on how to install and configure Open eShop on an Ubuntu 18.04 VPS with Apache web server, MySQL database server and PHP.