AWS DNS Outage RCA in a Nutshell
On October 19, 2025, AWS suffered a DNS failure that cascaded into EC2 and Network Load Balancer errors, knocking services offline for over a day. Ten days later, the root cause analysis revealed a DynamoDB lookup glitch that took out DNS and set off the cascade.
Video Breakdown
0:00 – High-level summary
5:30 – How Dynamo lost its DNS
13:41 – EC2 errors
16:16 – NLB errors
Full RCA here: https://aws.amazon.com/message/101925/
Watch on YouTube
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