Open DNS ManagerClick Start, Administrative Tools, DNS:

DNS Manager opens, Click on the Server IP address to highlight it.

Right-click the Server that was highlighted in the previous step and choose Properties:

A box like this will appear:

Click on the Forwarders Tab and ensure the following IP addresses are listed:

Click Ok, then click OK again.

Right-click on the server name in DNS Manager and chose Clear Cache - option 7 in the list:

Open a command prompt on the server and run the following command ipconfig /flushdns:

Test: Use a workstation to test. Open a command prompt on the workstation and run ipconfig /flushdns, then open a browser and navigate to different websites to ensure DNS name resolution is working as expected.