We now know why the DNS failed

On October 19, 2025 AWS went dark for over 24 hours—and ten days later the much-anticipated root cause analysis finally landed, spelling out exactly what took down their DNS.

The companion video breaks it all down: 0:00 is a high-level recap, 5:30 digs into how Dynamo lost its DNS entries, 13:41 covers EC2 errors and 16:16 tackles Network Load Balancer glitches. You’ll find the full RCA on AWS’s site, plus a ton of backend, networking and database courses if you’re itching to level up.

Watch on YouTube