Use nslookup Default server appears: Unknown Solution

1. When using the nslookup command to query DNS, display solution when the following information

   Default server: Unknown
   

2. Administrator, open a command line, run separately from the command line

   netsh winsock reset catalog
   netsh int ip reset reset.log hit
   

   winsock is a Windows network programming interface, winsock work at the application layer, independent of the underlying transport protocol which provides high-level programming interface data transmission, netsh winsock resetwill be restored to the winsock default state.

   netsh int ip reset reset.log hitResets the TCP / IP protocol

3. Restart the computer can be used normally nslookup