Title: Message
We have a single Windows 2003 SP1 forest/domain.  DCs run AD integated zones.  We have Forwarders configured for a domain e.g. test.com with 2 IP addresses entered for the DNS servers in test.com.
 
We have seen a strange issue where queries for a host in the sub-domain nyc.test.com fail (even when doing an nslookup directly from the DC).  When we restart the DNS service on the DC resolution succeeds for a host in nyc.test.com.  After time it appears resolution fails again.
 
Another observation is when (after time) name resolution fails for a host in nyc.test.com and we explicitly add nyc.test.com as another Forwarder and without restarting the DNS service names in nyc.test.com resolves.  Remove the forwarding to nyc.test.com and resolution fails!
 
Any ideas?
 
Regards
David

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