Talk:Tutorial: Proxy Connection/@comment-175.141.162.23-20150328032444/@comment-25983907-20150328042039

1. Call your ISP.

2. Reset your modem. Turn it off/on for 5 minutes and try again.

3. Change your preferred DNS server to Google Public DNS.

Source: http://www.canadawebdeveloper.ca/unable-resolve-servers-dns-address-fixed-problem/