Error code 521 is due to Cloudflare not being able to access your port 443

What does it mean? This is likely a configuration error.
I have this error on my website when I am trying to access it. Web server is down Error code 521
can someone help me, please?
Thank you
Best Regards, Szilard

If you pause Cloudflare, can you reach your site using https://?

If not, fix up your site first so the site is working using HTTPS on its own, then unpause Cloudflare and all should be good.

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