> 
> 
> But the servers ARE available - I can ping them by IP address from the
> server, plus all the client workstations are hooking up to 
> the internet
> and getting websites without problem.
> 

Type nslookup

then type

server <ip-address>

If the server is responding, you should get a reply from it.

You could try telnetting to port 53 of the DNS server's IP number (even
though most DNS queries are done by UDP, this is a useful test) just to test
connectivity.

Are there any firewall rules blocking traffic on port 53 for your server?

Marcus
  

http://www.sunbelt-software.com/ntsysadmin_list_charter.htm

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