We now know why the DNS failed

AWS suffered a massive outage starting October 19, 2025, that knocked DNS services offline for over a day. Ten days later, AWS published a detailed Root Cause Analysis revealing the chain reaction—starting with Dynamo’s DNS misconfiguration—cascading into EC2 failures and Network Load Balancer errors.

You can dive into the full RCA here: https://aws.amazon.com/message/101925/

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