Amazon Uncovers Root Cause of Major AWS Outage That Brokes The Internet

Amazon Web Services (AWS), the backbone for countless websites and services, faced a severe outage last weekend that disrupted operations for millions.

The incident, which unfolded in the early hours of October 20, 2025, exposed vulnerabilities in even the most robust systems and left users scrambling.

The trouble began at 11:49 PM PDT on October 19, when AWS reported elevated error rates across multiple services in its critical US-EAST-1 region.

This key data center, handling a massive portion of internet traffic, saw failures that cascaded to Amazon.com’s e-commerce platform, various subsidiaries, and even AWS’s own support teams.

Customers attempting to shop, stream, or access cloud resources encountered frustrating errors, with some services grinding to a halt entirely.

Path To Full Recovery And Lessons Learned

AWS engineers quickly pinpointed the root cause: DNS resolution problems affecting the regional endpoints for DynamoDB, their popular NoSQL database service.

DNS, the internet’s phonebook, failed to direct traffic properly, causing a domino effect. By 12:26 AM PDT on October 20, the team implemented fixes, restoring DynamoDB functionality by 2:24 AM PDT.

However, the outage’s aftermath lingered, impairing a subset of internal subsystems and prompting temporary restrictions on launching new EC2 virtual machines to prevent further instability.

Recovery progressed steadily through the morning. By 12:28 PM PDT, most AWS customers and dependent services, including major platforms like Netflix and government sites, reported substantial improvements.

Engineers gradually reduced the power on EC2 launches while fixing remaining issues. By 3:01 PM PDT, normal operations were fully restored, enabling smooth operations across the board.

In a detailed post-incident report, AWS emphasized the event’s scope and its rapid response. While no cyberattack was suspected, the outage highlighted the fragility of DNS in cloud ecosystems.

Experts note that such incidents underscore the need for diversified infrastructure and robust failover mechanisms.

AWS urges users to monitor the AWS Health Dashboard for ongoing updates, with a comprehensive summary available on their site.

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