Changing .de domain DNS is really such a hassle. I found a post here and finally managed to get my DNS changed. In summary: set up the new dns entries, they get checked during the change make sure the new dns are on different class c networks use the values from that post use that linked check tool from the de nic authoritiy beforehand works on the first try (Godaddy help values: 5 failed dns changes lol) hope this helps