Elementor loads JavaScript and CSS files from its plugin folder. A security plugin or web‑application firewall treats those URLs as unsafe and returns a 403 or 406 response. The block stops the editor and front‑end pages from receiving required assets.
The security layer enforces rules such as content‑security‑policy, hotlink protection, or file‑permission restrictions. When the rule matches an Elementor asset request, the server denies access and Elementor reports an error.