I’ve changed the nameservers to Cloudflare and as soon as the NS entry is propagated, the user stops seeing my site and starts to see an Apache HTTP Server Test page.
The entries should be correct, but Cloudflare does not recognize it and still claims there are old ones.
Your domain is not properly configured for Cloudflare. You did not change the nameservers but only created NS records at your host’s. You need to do the former instead.
Thanks. I’m not quite sure how to do that. My host does offer the option to either use external nameservers or change the zonefile. Using external nameservers did not propagate so far, while the zonefile did. I’ve changed the zonefile back for the moment and turned on external nameservers.
I’m also able to register new nameservers for the zonefiles, but this requires additional IP adresses for the nameservers.
You dont need to do anything at your host’s. You need to change the servers with your registrar. Contact the place where you registered the domain and ask them how to change the nameservers.