Summary: On October 19, 2025, AWS was knocked offline for over a day when a DNS configuration misstep cascaded through its services. Ten days later, Amazon published a root-cause analysis showing how a tweak to DynamoDB’s DNS setup triggered EC2 errors and, ultimately, Network Load Balancer failures.
Video breakdown:
- 0:00 Overview of the outage
- 5:30 How DynamoDB lost its DNS
- 13:41 EC2 error cascade
- 16:16 Network Load Balancer glitches
Watch on YouTube
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