How to fix NSLOOKUP Default Server: UnKnown?

Issue : “Default Server:  UnKnown” error on NSLOOKUP from Windows Server 2008 DNS Server.

How to fix NSLOOKUP Default Server: UnKnown?

Note : To show the server name a Reverse DNS Zone should be configured. If you do not have a reverse DNS configured please look in to my below post which is related to reverse DNS configuration.
http://www.randika.info/how-to-fix-nslookup-unknown-cant-find

This issue is not a critical one. Even under this error your DNS resolution can work smoothly. But it’s embarrassing when there are issues like this. Right?. Yes I know! me too. :D

The reason for this is your DNS server does not posses a record for the server itself. Or simply it does not know what is it’s own name. By creating a PTR static entry we can fix this and let DNS server know it’s own name.

1. Open the DNS management console in the Server 2008
Start > Administrative Tools > DNS

2. Go to the your Reverse Lookup Zone icon and right click on it and select “New Pointer(PTR)“.

How to fix NSLOOKUP Default Server: UnKnown?

3. In the New PTR window enter the  IP address of DNS server and enter(or select) the host name of the server.

How to fix NSLOOKUP Default Server: UnKnown?

4. Now click OK and restart the DNS server service.

Now check to see if it is working.

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