We Now Know Why the DNS Failed

Hussein Nasser digs into AWS’s October 19, 2025 outage that knocked DNS offline for over a day. In a neat breakdown he covers the high-level summary, then dives into how DynamoDB lost its DNS, the EC2 hiccups that followed, and finally the Network Load Balancer errors that sealed the deal.

Check the AWS RCA for all the gritty details, and if you’re hungry for more you’ll find links to courses on backend troubleshooting, Node.js internals, networking, databases, NGINX, Python, and more throughout the video.

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