How can I connect a subdomain?

I am trying to connect a subdomain, but it gives me a 521 error.
Not really sure how to solve the problem, although I have read a few articles in Cloudflare´s Docs.

Can anyone please help with that?
The subdomain is:

Thank you


Thank you for asking.

I am sorry to hear you’re experiencing an issue here.

In case you’re getting an error like “A record is missing”, please find more useful information at the article below:

Nevertheless, by using the step-by-step tutorial from below you can add a DNS record and point it to your origin host/server IP address to “connect the sub-domain”:

Furthermore, currently, I get the message “Invalid SSL certificate”, error 526.

Below are some suggestions and troubleshooting steps:

Before moving to Cloudflare, was your Website working over HTTPS connection?
If so, did you had an valid SSL certificate installed at your origin host / server which covers the needed sub-domain shop?

Can you double-check if your web hosting provider issued an SSL certificate which is still a valid one for your domain(s)? :thinking:

Before doing anything at Cloudflare settings, you could determine if you have a valid SSL certificate installed at the origin host/server by your web hosting provider or your own VPS/dedicated server following the steps from below:

  1. Use the “Pause Cloudflare on Site” option from the Overview tab for your domain at .
  2. The link is in the lower right corner of that page.
  3. Give it five minutes to take effect.
  4. Check with your hosting provider / cPanel AutoSSL / / Certbot / Let’s Encrypt or some other and renew it accordingly.
  5. Make sure site is working as expected without any errors via HTTPS.
  6. Only then should you un-pause Cloudflare and double-check your SSL/TLS setting to make sure it’s Full (Strict).

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

Furthermore, if you’d also like to have, then you’d have to purchase an Advanced Certificate Manager since it’s a case of an “deep sub-domain” for which the Universal SSL doesn’t work:

Last but not least, kindly have a look here for more information regarding correct SSL settings at the SSL/TLS tab on Cloudflare dashboard:

Hello Fritex,

many many thanks for the time you spent to help me with my issue.
There was a 521 error which I nearly managed to solve, and then I got the 526 error.
The whole thing was a problem with my provider and nothing related to Cloudflare.

I am going to mark this a resolved and once more I would like to thank you for your effort.


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