We just learned that the FBI might shut off the internet for millions of people in an effort to rid the country's Internet infrastructure of the DNSChanger Trojan. You should really check if you're infected—here's how.


In the possible-but-unlikely event that the FBI decides to cut off the internet to infected systems on March 8th, you don't want to get left in the dark. A simple check to see if your computer has the DNSChanger Trojan is very straightforward. Basically, you want to check your DNS connection against those known to be used by the trojan. If you point your browser to dns-ok.us, the website will run a quick check to see if you're all right.

You can also look up your computer's DNS and check it against the rogue DNS adresses by using a handy tool developed by the FBI. Once you've looked up your DNS, just enter it into the search box on this page, to see if you're among the infected.

The DNSChanger Working Group provides instructions with images on how to lookup the DNS server you are using:

• On Macs, go to your System Preferences, click Network. When the dialog pops up, click Advanced, then select the DNS tab, where you'll see a listing of the DNS servers you're using.


• On a Windows machine you need to open your computer's DOS command prompt to check your machine. In Windows XP type (without quotes) "ipconfig /allcompartments /all". In Windows 7, type "ipconfig /all". The resulting gobbledygook will have a line that reads "DNS Servers" (Windoes 7) or "DNS Settings" (Windows XP).

While these checks certainly aren't a fool-proof substitute for a professional assessment, they're fairly reliable way to check if you're infected. It's easy, people. Go do it now. [FBI and DNCWG]


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