The problem began in last November when FBI and other security authorities took down hackers running an international advertising scam. The hacker group had run an internet ad scam by infecting internet users’ DNS settings, and sending them to hacker controlled DNS servers which lead the users to false sites. The hackers earned from the advertisement money they showed on those websites. When the security authorities nabbed the hackers, they took down the DNS servers. But, the affected computers’ DNS system were broken and can’t work with other DNS servers. This would have led the infected computers out of the internet. That’s why the security authorities established a safety net by using government operated DNS servers for those computers.