Reverse proxy via nginx - CloudFlare SSL

[fritex]

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.

Why you should choose Full Strict, and only Full Strict

Unencrypted & unverified connections Imagine you open Paypal and suddenly get that warning [image] Would you continue? Probably not. For decades leaders in IT security have advocated that people upgrade their sites from unencrypted HTTP to secure HTTPS. And for a reason, everything you send via an HTTP connection is sent in plain text and can be intercepted at any point between you and the server. Equally, you’d probably not proceed if you got such a warning, right? [image] That’s when th…

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

Deprecated - Step 2: Setting up SSL with Cloudflare

This tutorial is deprecated in favour of Get started with SSL/TLS · Cloudflare SSL/TLS docs

Archive

This tutorial covers getting SSL working with Cloudflare in various different scenarios. This assumes you already have your website set up on Cloudflare with all your DNS records set to , if not - please visit <a href="https://community.cloudflare.com/t/64309">Step 1</a>. Do you want the website to use HTTPS? Yes Do you already have a valid SSL certificate installed…

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:

• Troubleshooting Cloudflare 5XX errors

Community Tip - Fixing Error 521: Web server is down

Error Try the suggestions in this Community Tip to help you fix Error 521: Web server is down. Background A 521 error happens when we are unable to make a TCP connection to your origin server. Specifically, Cloudflare tried to connect to your origin server on port 80 or 443, but received a connection refused error. This is often caused by security or firewall software and happens if the origin server has directly refused Cloudflare’s proxy request. [Banner in tip catalog] Quick Fix Ideas …