TL;DR

AWS’s massive outage on October 19, 2025—which knocked out DNS for over a day—was finally explained 10 days later in the official Root Cause Analysis. A misstep in Dynamo’s DNS handling kicked off a cascade of failures, with EC2 instances and Network Load Balancers tipping over in turn.

For the full deep dive (with timestamps!), check out AWS’s RCA here: https://aws.amazon.com/message/101925/

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