From WIKI HOW:
Change your DNS server. You can manually enter an alternative DNS server to attempt to connect to instead. To do so, open the "ncpa.cpl" window again and right-click on your active connection. Select "Properties".[2]
In the Networking tab, scroll down until you find the "Internet Protocol Version 4 (TCP/IPv4)" entry. Click it to select it and then click the Properties button.
Click the "Use the following DNS server addresses" option.
Enter 208.67.222.222 into the "Preferred DNS server" field
Enter 208.67.220.220 into the "Alternate DNS server" field.
These are DNS servers maintained by OpenDNS, an open-source DNS service.