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Learn about the root cause analysis of AWS's major DNS outage that occurred on October 19, 2025, lasting over a day, through this detailed technical breakdown. Explore the chain of failures that led to DynamoDB losing its DNS resolution capabilities, examine the cascading EC2 errors that compounded the problem, and understand how Network Load Balancer issues contributed to the extended downtime. Gain insights into AWS's infrastructure dependencies and discover how a seemingly simple DNS failure can trigger widespread service disruptions across multiple AWS services, based on the official root cause analysis released 10 days after the incident.
