Hi there, I've just install a fresh new server with Debian 10 and ISPConfig following https://www.howtoforge.com/perfect-server-debian-10-buster-apache-bind-dovecot-ispconfig-3-1/ I added DNS zones for my websites and tried to change their DNS conf in the registrar setup to attach them to my new server. It works fine with .com TLD's but with .fr TLD's I get an error message saying "NAMESERVERS VALIDATION FAILED - The nameserver doesn't exist". The DNS is sd-133392.dedibox.fr and if I try a host on this, i get the good IP address. If I try a host on the IP address i get the good nameserver. So i'm kind of lost. Does someone has an idea to fix this? Or a starting point to look for?