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Hussein Nasser: We now know why the DNS failed

AWS’s DNS meltdown on October 19, 2025 turned into a 24-hour-plus saga, and only 10 days later did AWS drop the long-awaited root cause analysis.

It turns out a cascading chain reaction took out the whole system: DynamoDB lost its DNS entries, EC2 started throwing errors under the hood, and finally Network Load Balancers misrouted traffic—bringing DNS resolution to its knees.

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