Though it seems my DNS server on NW 6.5sp5 works fine, if I type in Nslookup
from any workstation it always complains
*** Can't find server name for address 192.168.0.252: Non-existent domain
*** Can't find server name for address 192.168.0.251: Non-existent domain
These IP's are my two DNS servers.

What would be causing this?

Thanks