Question : DNS Lookup Failed

DNS on our Server 2008 box intermittently forgets where websites are, and is not forwarding requests upstream to another DNS server. How do I fix that?

The code snippet below illustrates the point. domainx.com is up and doesn't have a problem according to dnsstuff.com, but our local DNS server can't find it.

Code Snippet:

         
           
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             Default Server:  UnKnown
Address:  192.168.250.81
 
> set type=mx
> domainx.com
Server:  UnKnown
Address:  192.168.250.81
 
DNS request timed out.
    timeout was 2 seconds.
*** Request to UnKnown timed-out
> set type=a
> domainx.com
Server:  UnKnown
Address:  192.168.250.81
 
DNS request timed out.
    timeout was 2 seconds.
*** Request to UnKnown timed-out
> google.com
Server:  UnKnown
Address:  192.168.250.81
 
Name:    google.com
Addresses:  64.233.187.99
          64.233.167.99
          72.14.207.99
 
> set type=mx
> google.com
Server:  UnKnown
Address:  192.168.250.81
 
google.com      MX preference = 10, mail exchanger = smtp4.google.com
google.com      MX preference = 10, mail exchanger = smtp1.google.com
google.com      MX preference = 10, mail exchanger = smtp2.google.com
google.com      MX preference = 10, mail exchanger = smtp3.google.com
google.com      nameserver = ns1.google.com
google.com      nameserver = ns2.google.com
google.com      nameserver = ns3.google.com
google.com      nameserver = ns4.google.com
smtp4.google.com        internet address = 72.14.221.25
smtp1.google.com        internet address = 209.85.237.25
smtp2.google.com        internet address = 64.233.167.25
smtp3.google.com        internet address = 64.233.183.25
ns1.google.com  internet address = 216.239.32.10
ns2.google.com  internet address = 216.239.34.10
ns3.google.com  internet address = 216.239.36.10
ns4.google.com  internet address = 216.239.38.10
> domainx.com
Server:  UnKnown
Address:  192.168.250.81
 
DNS request timed out.
    timeout was 2 seconds.
*** Request to UnKnown timed-out
> domainx.com
Server:  UnKnown
Address:  192.168.250.81
 
DNS request timed out.
    timeout was 2 seconds.
*** Request to UnKnown timed-out
> mail.domainx.com
Server:  UnKnown
Address:  192.168.250.81
 
DNS request timed out.
    timeout was 2 seconds.
*** Request to UnKnown timed-out

           
         

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Question : DNS Lookup Failed

Answer : DNS Lookup Failed

Are the forwarder entries on the 2008 server configured to point to the upstream server?