TL;DR
On October 19, 2025, AWS hit a massive DNS outage that lasted over 24 hours. Ten days later, their Root Cause Analysis revealed a misconfigured routing change in DynamoDB that prevented DNS records from propagating properly, which in turn tripped up EC2 instances and downstream Network Load Balancers.
In a concise video breakdown you’ll find:
- 0:00 High-level summary
- 5:30 How DynamoDB lost its DNS
- 13:41 EC2 errors
- 16:16 Network Load Balancer failures
Read the full RCA here: https://aws.amazon.com/message/101925/
Watch on YouTube
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