I have 3 servers with powerdns.
when i will register a .de domain, denic told that the port of ns1 and ns2 is unreachable.
I havent install a firewall, sow thats not the problemen. And if i type netstat -nan | grep 53
The 904 error occured, when I was trying to update a .de Domain. I used nast.denic.de to check whats going on, but firstly cant find an error.
After playing around I saw, that I forgot to bind the IP addresses for my powerdns server. After that, I got an error 106 from denic, which told me that there is something wrong with the determined glue records. After activating ipv6 additional processing, the 106 error also was gone and anything is working fine now.