Swarms of hacked, internet-connected devices have menaced core parts of the web and put utilities on edge.

On Friday, millions of Americans awoke to find they couldn’t access many popular websites, including Twitter, Spotify and Github. Hackers had overwhelmed the cyberdefenses of Dyn, a New Hampshire-based company that manages web traffic for thousands of U.S. sites. The outages lasted, on and off, for several hours.

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