Website closed connection

[fritex]

Greetings,

I am sorry to hear you are experiencing an issue with Error 522.

Before moving to Cloudflare, was your Website working over HTTPS connection?

Also, was your sub-domain working over HTTPS and have you had a valid SSL certificate?

May I ask what SSL option have you got selected under the SSL/TLS tab at Cloudflare dashboard for your domain ( Flexible, Full, Full Strict … )?

May I suggest below articles:

Deprecated - SSL/TLS not working on subdomain

This tutorial is deprecated in favour of Troubleshooting · Cloudflare SSL/TLS docs

Archive

Please note, this tutorial post contains links to external sites. I am not endorsing any external links. This tutorial post covers the first steps you should take if SSL is working on your main domain, but not on a subdomain. 1. Is there a DNS record for it? Check the DNS app in your Cloudflare dashboard to see if there is a DNS record there for that subdomain. 2. Check that the DNS record is working co…