TL;DR

On October 19, 2025 AWS hit a massive DNS outage that dragged on for over 24 hours. In the official root-cause analysis released 10 days later, AWS pinpointed a misconfiguration in Dynamo’s DNS setup as the trigger—an issue that cascaded into EC2 hiccups and Network Load Balancer failures.

If you want the full deep dive (with handy timestamps like 5:30 for “How Dynamo lost its DNS,” 13:41 for EC2 errors and 16:16 for NLB errors), check out the AWS RCA. The video’s description also doubles as a treasure trove of backend-engineering courses, Node.js/NGINX/Python training, and other once-in-a-blue-moon learning links to help you prevent your own production meltdowns.

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