SERVFAIL problem

[Stephan M. Ott // OKDesign oHG]

Hi folks,
I seem to have a problem with my dns....
Since I changed the main-IP of the server, I get lots of error-messages in
my /var/log/messages - file.
the message is

server2 named [#PID]: sysquery: findns error (SERVFAIL) on *different
dns-names*

(I replaced the PID and the DNS-names at the end, as they change)

But, the nameserver is running and nslookup also works fine.
Has anybody an idea what I did wrong ?
Oh, BTW, I'm running SuSE-Linux 6.0.
Any help would be greatly appreciated.
TIA
Stephan