Yesterday, folks across the country reported that Comcast internet was down — an unusually large outage that lasted around 90 minutes. It turns out that the problem was caused by Level 3, an enterprise ISP that provides the backbone for other internet providers like Verizon, Comcast and RCN. “Our network experienced a service disruption affecting some of our customers,” the firm said in a statement. “The disruption was caused by a configuration error.”

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