I added the following domain as a slave to the sec. dns server, using webmin, and this is what the AU domain registrar authority screams when trying to set the dns for the domain:

ns.hostay.net is not listed as a NS for domain 4ttt.org.au by server ns.hostay.net (ns.hostay.net)

Doesn't make sense. I've checked the dns records, they are correct.

Anybody else have problems with AU???

Well right now when I tried to query ns.hostay.net I'm not getting any answer of any sort. If the AU registrar got the same lack of response it would probably have assumed that the server didn't have an entry for that domain.