sometime can't resolve

Hi,
There is a strange thing, sometime if i want resolve in nslookup,
it's ok. but sometime not. would u give me some advice?

failed:
> internet.mnc097.mcc466.gprs
Server: dns01.fj.gprs.chinamobile.com
Address: 10.47.24.218

*** dns01.fj.gprs.chinamobile.com can't find internet.mnc097.mcc466.gprs: No response from server
> exit

successful:
> internet.mnc097.mcc466.gprs
Server: dns01.fj.gprs.chinamobile.com
Address: 10.47.24.218

Name: internet.mnc097.mcc466.gprs
Addresses: 61.30.96.65, 61.30.96.66, 61.30.96.68, 61.30.96.69
61.30.96.70, 61.30.96.71


and some log in syslog.log:
Dec 18 00:52:20 FZDNS01BNK named[432]: slave zone "internet.mnc000.mcc460.gprs" expired
Dec 18 00:52:20 FZDNS01BNK named[432]: Err/TO getting serial# for "internet.mnc000.mcc460.gprs"
Dec 18 00:52:20 FZDNS01BNK named-xfer[1091]: [10.47.24.231] no SOA found for internet.mnc000.mcc460.gprs, SOA query got rcode 5, aa0
Dec 18 00:53:28 FZDNS01BNK named[432]: sysquery: no addrs found for root NS ()
Dec 18 00:53:32 FZDNS01BNK above message repeats 23 times

BTW,where can i get explain for DNS error?

br,ltian

At a guess - without making some queries myself - looks like your master is properly configured but your slave is not. Sometimes your master is queried to resolve the domain and it works. Sometimes your slave is queried to resolve the domain and it doesn't.

internet.mnc000.mcc460.gprs is not a zone on the master server. It has no "SOA" record. You might want to try "mnc000.mcc460.gprs" in your slave configuration instead. If that doesn't work, you should try "mcc460.gprs".