How can I connect a subdomain?

[Asterios]

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:
https://shop.koelner-musikakademie.de/

Thank you
Asterios

[fritex]

Greetings,

Thank you for asking.

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

@Asterios

https://shop.koelner-musikakademie.de/

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

An A, AAAA or CNAME record was not found

This post contains info on the errors: An A, AAAA or CNAME record was not found… Causes of this error This error is caused when there is no relevant A, AAAA or CNAME record in Cloudflare for your domain or www.yourdomain. It can also appear in reference to MX records if one is not present for your domain. Tips for fixing the error You will need to add a DNS record pointing to your host for your website to function correctly. The content of the record needed will be available via their contro…

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”:

Adding DNS Records

This tutorial covers adding general DNS records and specifically A, AAAA, CNAME, MX and TXT records. Go to the DNS app of your Cloudflare dashboard. Enter your credentials and click ‘Log In’ Click the domain in question Click [image] [Please note, the content of the records below are solely for example purposes and should be replaced by valid records with content provided by your web host] Please select which record you need help adding:

A Record

<a class="lightbox" href=&quot…

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

Below are some suggestions and troubleshooting steps:

Community Tip - Fixing Error 526: Invalid SSL certificates

Error Try the suggestions in this Community Tip to help you fix Error 526: Invalid SSL certificate. Background Error 526 indicates Cloudflare is unable to successfully validate the SSL certificate on the origin web server and the SSL setting in the Cloudflare SSL/TLS app is set to Full SSL (Strict) for the website. When this happens, you’ll see “Error 526: Invalid SSL certificate”. [Dedicated SSL] Quick Fix Ideas If the origin server is configured to use a self-signed certificate, instal…

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)?

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 dash.cloudflare.com .
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 / ACME.sh / 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:

Step 2: Setting up SSL with Cloudflare

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 Step 1. Do you want the website to use HTTPS?

Yes

Do you already have a valid SSL certificate installed on your server (i.e. does it already load over HTTPS with a )? Yes If your website already works over HTTPS, you can just set your SSL mode in Cloudflare to Full (strict)…

Furthermore, if you’d also like to have www.shop.koelner-musikakademie.de, 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:

Subdomain too deep

This tutorial covers a possible reason for the SSL_ERROR_NO_CYPHER_OVERLAP and ERR_SSL_VERSION_OR_CIPHER_MISMATCH errors (Firefox and Chrome respectively) when seen on a subdomain. The Cloudflare universal certificates cover example.com and *.example.com. This means that it covers any subdomain one level below the domain you signed up with. It will cover www.example.com and subdomain.example.com, as these are one level below the root domain, example.com. The certificate will not cover www.sub…

Advanced certificates · Cloudflare SSL/TLS docs

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

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…

[Asterios]

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.

Best
Asterios