We now know why the DNS failed

AWS’s October 19, 2025 outage—which knocked services offline for over a day—finally has a detailed root-cause analysis. It boils down to a cascading series of failures: DynamoDB lost its DNS entries, EC2 instances started throwing errors, and Network Load Balancers couldn’t route traffic properly.

If you want the full deep dive, AWS published the official RCA, but this breakdown hits all the big moments: how the DNS records got borked, what went wrong with EC2, and why the NLBs couldn’t save the day.

Watch on YouTube