I'm testing a setup created by ISPConfig Migration Tool from my old setup. Testing the new multiserver setup with one main host with everything and two name servers, I saw the names servers do not receive zone transfers, and thus do not answer to any queries about my domains. The name service does work on the main host. I have checked logs, and enabled debug, stopped cron starting the server script and started it manually. I can not see any errors anywhere about why zone transfers do not happen. I did remember to change the "Allow zone transfers to these IPs" for the new name servers. I compared this setup to another ISPConfig multi server setup and can not see what is different in DNS settings. How to find out how to fix the zone transfers?