Contrary to this SO question this is for a dotted name (
gw.localnet.au), and it doesn't happen straight away. Only after some period of time (quite a long time, possibly days).
In fact this is for my ADSL router and its internal IP address which I have named within the router itself and in my Windows Server 2003 Domain Controller DNS Service. Specifically,
localnet.au is a Active-Directory-backed primary domain.
In fact, an
ipconfig /flushdns may fix the problem, but only after a while (about the time it took me to type in this question :-) ).
That doesn't explain the root cause though...
EDIT: My machine that is failing is Windows XP SP3.
Manually transferred from stackoverflow.com