5 Stars4 Stars3 Stars2 Stars1 Star (18 votes, average: 4.94 out of 5) How to Fix Cloudflare Error 520: Web Server Is Returning an Unknown Error?Last Modified: December 24, 2025 A visitor enthusiastically hops onto your site, searching for some information. When they click on it, all they see is this message: “Error 520: Web Server Is Returning an Unknown…
