TL;DR

On October 19, 2025 AWS went down for over 24 hours—and it took them 10 days to spill the beans. The root cause? A DNS meltdown triggered when Dynamo lost its records, which then cascaded into EC2 and Network Load Balancer hiccups.

This video walks you through the highlights (0:00 summary, 5:30 Dynamo DNS loss, 13:41 EC2 errors, 16:16 NLB errors) and drops a link to the full AWS RCA, plus a bunch of handy backend/networking course links if you want to level up.

Watch on YouTube