Thanks @cpu,
Your information is very helpful. I configured IPv6 with the desired to move up since IPv6 is the new way to re-distribute connection to devices and servers. My DNS is configured to work without errors, so also my home network. I can reach the ipv6 from my Browser inside my network but is not resolving to the www. I am looking into some alternatives and if that does not work, I will have no alternative but to turn off IPV6 on my server.