DNS server may stop resolving domain names for which it is not authoritative.

Hits: Failed to execute CGI : Win32 Error Code = 3

When a DNS server boots, it needs a list of root server "hints" -- NS and A records for the servers -- historically called the cache file. Traditionally DNS administrators could keep this file current by downloading a new copy from the InterNIC. This method works adequately when the root servers stay fairly static, but does require attention on the part of the administrator when updates and changes are made: Q195811