Originally Posted by Tommahawk
As I was working on the subdomains, tip: don't name your subdomain zones (named.conf) the same as your host server it causes DNS restart to fail due to duplicate zone name exists. Hopefully an ISPConfig update will check the zone name for dups before adding it.
ISPConfig does not create duplicates if you enter something in the interface and you should not edit named.conf manually. If you edit the file anyway, you have to take care of this as ISPConfig does not parse the config file to check if you modifed something and we will most likely not implement config file parsing in future.