Amazon Web Services (AWS) experienced a significant outage originating in its US-East-1 region, which is one of the company's most critical data hubs. The incident began early Monday morning, with AWS reporting increased error rates and latency for multiple services, including EC2, Lambda, and DynamoDB. The root cause was identified as a Domain Name System (DNS) resolution failure affecting the DynamoDB API endpoint, which quickly cascaded to impact a wide array of dependent AWS services. As a result, dozens of major websites, applications, and online platforms worldwide became inaccessible or experienced severe slowdowns. Consumer-facing services such as Snapchat, Roblox, Fortnite, Zoom, Snapchat, Amazon Alexa, Ring, Robinhood, Max (HBO), Chime, Venmo, Epic Games, McDonald's, Lyft, Hulu, Disney+, Roku, Signal, and major telecom carriers like AT&T, Verizon, and T-Mobile were all affected. The outage also disrupted PC gaming platforms like Steam, online forums such as Reddit, and popular banking and financial apps, including Coinbase and Robinhood. Even Amazon's own services, including Amazon.com and Prime Video, suffered partial outages. The effects of the outage were not limited to North America; major banks in the UK and the European Union, such as Lloyds Banking Group, and some government sites also experienced downtime. AWS engineers worked on multiple parallel paths to accelerate recovery, applying initial mitigations and observing signs of service restoration within a few hours. The outage highlighted the critical dependency of the modern internet on AWS infrastructure, as disruptions in a single region can have global repercussions. AWS's service health dashboard confirmed that at least 28 separate AWS services were impacted during the incident. Customers were advised to retry failed requests and monitor for further updates as AWS continued to address the issue. The incident also affected global services or features that rely on US-East-1 endpoints, such as IAM updates and DynamoDB Global tables. Some AI services, including Perplexity, were also reported to be struggling during the outage. The event underscored the importance of DNS reliability and the potential for single points of failure within cloud infrastructure. AWS communicated regularly with customers throughout the incident, providing updates on the root cause and recovery progress. By the end of the morning, AWS announced that the outage had been resolved, and services were returning to normal operations. The widespread impact of this outage serves as a reminder of the interconnectedness of cloud services and the need for robust contingency planning for critical internet infrastructure.

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On 2025-10-24, Amazon published its explanation of the outage, saying a major DNS failure and automation systems race condition created a single point of failure that triggered the widespread disruption. The post-mortem clarified the technical root cause behind the October 20 incident.
By 2025-10-21, follow-up coverage said the outage had affected more than 1,000 organizations and was being blamed on a DNS issue. The incident was also framed as evidence of concentration risk in cloud infrastructure.
AWS resolved the core technical problems by about 6:35 a.m. ET on 2025-10-20. Some customers and downstream services continued to experience aftereffects and backlogs even after the main fault was fixed.
AWS began mitigation around 5:22 a.m. ET as engineers worked to contain the DNS-related failure in US-EAST-1. Reporting indicated the company was actively restoring affected dependencies and service availability.
The AWS failure knocked offline or degraded numerous services, including Amazon properties, Prime Video, Fortnite, Roblox, Zoom, Snapchat, WhatsApp, ChatGPT, Venmo, Perplexity, and some UK government websites. Multiple reports described the event as a large-scale internet outage caused by heavy dependence on AWS infrastructure.
On 2025-10-20, Amazon Web Services suffered a major outage in its US-EAST-1 region. The disruption was tied to DNS resolution problems affecting DynamoDB API endpoints and quickly cascaded into broader service failures.
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