csf is an easy SPI iptables firewall suite. lfd is the login failure daemon, which scans log files for failed authentication and blocks the IP’s doing that.

What is CSF in networking?

ConfigServer Firewall (CSF) is a Firewall software installed on your server to keep it secure. It provides an advanced and easy-to-use web-based interface to manage firewall settings.

What is CSF cPanel?

ConfigServer Firewall (CSF) is commonly used on cPanel servers to stop malicious traffic going in and out from a server. Like most other firewalls, CSF is a frontend for iptables. One of the main advantages of CSF is that it has a graphical interface.