Cloudflare proxy does not work - 520 ERROR

System Info:


Cloudflare without proxy (http://) works, but as soon as I switch to proxied (https://) and “flexible” SSL activated, it shows a Error 520 page.

Is there some settings I can edit?

When I switched from “flexible” SSL to “full” SSL in Cloudflare it worked better. As the website also is encrypted with LetsEncrypt.

That was the only reason I didn’t reply. You said:

And that’s usually what it always is: people use Full or Full strict. It’s usually the other way around that causes the problem.

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