Howdy, everyone. Lisha here, working as IT supervisor. Many WordPress users ask, why cloudflare error 521 notice appears? When Cloudflare is unable to establish a TCP connection to your origin server, Cloudflare encounters error 521. Cloudflare must have tried but was unable to connect to your origin server over port 80 or 443. The most typical reason of error 521 is security or firewall software. It occurs when the origin server explicitly denies Cloudflare's proxy request.
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