I have created 2 name servers server1.example.tld and server2.example.tld with ISPConfig3 installation (by manual "How To Run Your Own DNS Servers") and they working perfect. Also I have created my hosting website "example.tld" with WHMCS at server1.example.tld and it also works. And... I have installed ISPConfig3 on server 3 "server3.example.tld". This server (and aditional others) for my clients websites. And there I have a problem.. HOW TO CONNECT CLIENTS SERVER (server3.example.tld) to my network / name servers (server1.mysite.tld and server2.mysite.tld)? I have added some sites to server3.example.tld (hosting, DNS records are creaded there) I have changed name servers of these sites (at domains registrars) to server1.example.tld and server2.example.tld Now Im waiting 3 days, but sites not found on the internet.. It seems to me that the problem is between Name servers server1.example.tld / server2.example.tld and --> Web hosting server server3.example.tld Seems that name servers server1.example.tld and server2.example.tld can't see that the client sites are in the server3.example.tld... Please HELP!