York said that his company worked with Akamai and Flashpoint to analyze the source of the junk traffic that targeted its managed DNS services, which provide on-demand DNS servers for popular websites such as Reddit, Imgur, Twitter, GitHub, Spotify, Soundcloud, PayPal, Yelp, and others. Because of this DDoS attack, Dyn’s DNS servers weren’t able to resolve DNS queries for the aforementioned services, and users couldn’t access those websites, because their browsers and apps couldn’t resolve the “domain.com” text into an IP address where they needed to connect.
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Original source: Softpedia