How to fix Windows 7 DNS server not responding

1. Click "Start", input "NCPA.CPL" (without quotation marks) and press Enter.
2. Right click on the connection that you use for the local connection, and then click "Properties".
3. Click to select "Internet Protocol Version 4 (TCP/IPv4)", and then click "Properties".
4. In the Internet Protocol window, let's change the "Preferred DNS server" to 208.67.222.222
5. Click 'OK' twice to complete the modification.
If the issue persists, please repeat the steps and change the "Preferred DNS server" to 208.67.220.220.



Thanks to :Novak