On July 9, the FBI will unplug a network of Rogue DNS servers that many people have been depending on for proper Internet access. DNS and DNS Servers are a critical component of your computer’s operating environment—without them, you would not be able to access websites, send e-mail, or use any other Internet services.
FBI has identified a ring of DNS servers which have been hosted by criminals for the purposes of stealing personal information or getting people to click on ads. The criminals have been using a malware to change the DNS server settings in computers and SOHO routers around the world (this DNS Changer malware replaces the ISP’s good DNS servers with bad DNS servers operated by the criminal). This malware has been widespread enough that even third-party companies like Google and Facebook and a number of ISPs like Comcast, COX, Verizon, and AT&T have also been helping FBI to remove it by issuing automatic notifications to users that their systems are configured with the rogue DNS network.
If a green background shows up, you’re in the clear. But if it’s red, you need to take your computer in for professional service.
Information on how to determine your DNS settings, along with other technical details about DNSChanger, can be found at here.