To use the WordPress Firewall, your server must have the HeatShield agent installed. The HeatShield agent is required because HeatShield uses an extremely fast, enterprise-grade Web Application Firewall engine, ModSecurity, that cannot be run within WordPress.
If you have your own server, you can install the HeatShield agent if your server meets the requirements.
|Operating System||Ubuntu LTS 16.04, 18.04, or 20.04|
If you use managed hosting, please contact your hosting company to see if they support HeatShield.