DNS Server does not have a cache (or database) entry for root name server. The cache file MUST have at least one NS record, indicating a root DNS server and a corresponding A record for that root DNS server. Otherwise the DNS server will be unabl
The cache file contains name-to-IP-address mappings for the DNS servers on the Internet root. The cache file is used to resolve over the Internet name queries from outside the enterprise network. DNS automatically installs a cache file in the Systemroot\System32\Dns directory.
Use the cache file that was automatically installed when DNS Manager was installed. If you need to obtain a new copy, connect to internic.net and download the cache file from there. If you cannot connect to the Internet, delete the current cache file and create a new one by first backing up all of your database files and then reinstalling DNS Manager.