DNS issues...

Archived from groups: microsoft.public.win2000.general (More info?)

I've inherited a Win/Exch2000 Network that I'm about to upgrade to 2003 but
I'm having a few issues.
Firstly Dynamic DNS doesn't register new machines. ie when I join a new XP
PC to the domain, it connects, works perfectly, can resolve all names, but
the host record doesn't show up in DNS.
On DC2, I run Netdiag and Dcdiag and everything comes up good. But on DC1
Netdiag fails the DNS test:

DNS test . . . . . . . . . . . . . : Failed
[WARNING] The DNS entries for this DC are not registered correctly on
DNS se
rver '10.61.20.10'. Please wait for 30 minutes for DNS server replication.
[WARNING] The DNS entries for this DC are not registered correctly on
DNS se
rver '10.61.20.12'. Please wait for 30 minutes for DNS server replication.
[FATAL] No DNS servers have the DNS records for this DC registered.

I 've been through as much MS doco as I could find about this, checked
dynamic updates are allowed, restarted netlogon services, tried ipconfig
/registerdns, but nothing seems to work. For whatever reason I can't get
this test to pass.
The strange part is that everything appears to work ok, and the test passes
fine on DC2.

Should I just transfer FSMO roles to DC2 (all currently on DC1), and blow it
away?
I'd like to fix this before I upgrade, or is ok to upgrade to 2003 and see
if it fixes itself?

FWIW this install looks to be an upgrade from an NT Domain some years ago
and has still a single name domain (ie no .com) and a different Netbios
Domain name. Apparently this can be as issue but I tried those fixes too
without any luck.)

TIA