I can only set up Flexible SSL/TLS. How to set the Full or Strict Full

If i set the Full or Strict Full. then the site will be responded the Web Server is shut down 521 errors.

Your aim should be to use “Full (strict)” only so your and your users’ data is secured end-to-end.

For that you need to have HTTPS enabled on your origin and either a Cloudflare origin certificate, or a LetsEncrypt or other SSL certificate, installed on it.

The best way is to pause Cloudflare, get your HTTPS and SSL certificate set up and working when connecting directly to your origin and then when it all works, you can unpause Cloudflare again. Debugging SSL setups while the proxy is in the way is more difficult.

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Ok get it.

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