I have a Cloudmin server with 'vps1.mysite.net' as the master DNS zone. So all the vps guest systems created on this Cloudmin server, get their respective A-records, like for example:
bob.vps1.mysite.net. IN A xxx.xxx.xxx.xx
automatically reflected in the following file:
/var/named/vps1.mysite.net.hosts
However, they never actually start resolving to their respective IP addresses. Pinging bob.vps1.mysite.net doesn't give any results. I have similar setup with a just sub-domain as Cloudmin master DNS zone and have no problem with resolving the guest systems hostnames. However, on this system with sub-sub-domain as master DNS zone, unfortunately I couldn't resolve this issue. Is it possible to make this work with a sub-sub-domain?
I'm actually having a similar problem on my web server in Virtualmin. I think I know why, since DNS resolves from right to left (ex: net.mysite.vps1.bob) I had a DNS record for "bob" but not for "vps1". Does your subdomain have a DNS record? What I'm thinking is the DNS resolved to "mysite" and couldn't resolve (in my case it was "storage" sub domain that didn't have a record) so it wasn't able to resolve the sub-sub domain as you put it.
Does that make sense? lol