With WordPress and Cloudflare, how to Fix Error 521?
The first step in understanding and resolving the how to fix error 521 prohibited issue' is to ensure that you have a Cloudflare Origin Certificate setup. Ensure that you possess a Cloudflare Origin Certificate configured if your SSL/TLS mode is tuned to Full or Full (Strict) and Cloudflare's proxy is configured for port 443. Your origin server may be set to accept HTTPS connections on port 443, but only if it supplies Cloudflare with a valid certificate. If it doesn't, the 521 error might occur (or a 526 error). In such a situation, a Cloudflare Origin Certificate may be installed on your server.
Visit also here: https://www.wordpresssupport.c....o/know-what-error-52
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