ConfigServer Security & Firewall (CSF) is a popular VPS security tool for Linux. It provides a simple interface for iptables to protect Linux servers. CSF comes with multiple features: a stateful packet inspection firewall (SPI), intrusion detection, a login failure daemon, DDOS protection, and control panel integration. This tutorial covers installation, basic configuration, and essential commands for CSF on Ubuntu 20.04. * Deploy a new [Ubuntu 20.04 Vultr VPS](https://www.vultr.com/servers/ubu......