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DNS glitch that threatened Internet stability fixed; cause remains unclear
For 4 days, the c-root server maintained by Cogent lost touch with its 12 peers.
If keys aren’t identical across all 13 root servers, there’s an increased risk of attacks such as DNS cache poisoning. For reasons that remain unclear outside of Cogent—which declined to comment for this post—the c-root it’s responsible for maintaining suddenly stopped updating on Saturday. Stéphane Bortzmeyer, a French engineer who was among the first to flag the problem in a Tuesday post, noted then that the c-root was three days behind the rest of the root servers.
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