Reverse proxy via nginx - CloudFlare SSL

Hi, do you know where the problem is? I made a Reverse proxy through Nginx and I need to have it under Cloudflare proxy.
Screenshots: Imgur: The magic of the Internet

Screenshots: Imgur: The magic of the Internet

Greetings,

Thank you for asking.

I am sorry to hear you are experiencing an issue with your domain name.

Furthermore, thank you for providing screenshots as a feedback information.
From what I see of your posted screenshots, you are using Cloudflare Origin CA Certificate and have the Authenticated Origin Pulls option enabled.

May I ask what SSL option have you got selected when you navigate to the SSL/TLS tab at Cloudflare dashboard for your domain name? → It should be set on the Full (Strict) SSL.

Here is a way to re-check if you correctly setup the SSL for your domain with Cloudflare:

And you are also experiencing 521 error. Regarding Cloudflare 521 error, may I suggest you to try looking into below articles to troubleshoot the issue:

Hi fritex, I had Full SSL so I changed to Full (Strict) SSL and the site still doesn’t work, error 521 :confused:

The site is otherwise online , when I remove it from Cloudflare I can see it.

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