AWS Service Disruption in US-EAST-1 Region: October 19-20, 2025 Incident Report
By
meetpateltech
A baker's-dozen of insight crammed into one ring.
Summary
Amazon experienced a significant service disruption in its Northern Virginia (US-EAST-1) region from October 19-20, 2025, affecting multiple AWS services. The incident involved three distinct periods: first, DynamoDB experienced increased API error rates from 11:48 PM PDT October 19 to 2:40 AM October 20; second, Network Load Balancers had increased connection errors from 5:30 AM to 2:09 PM October 20 due to health check failures; and third, EC2 instance launches failed from 2:25 AM to 10:36 AM October 20, with connectivity issues persisting until 1:50 PM. The overall event lasted approximately 14.5 hours, impacting customer applications across multiple AWS services.
Key quotes
· 4 pulledAmazon DynamoDB experienced increased API error rates in the N. Virginia (us-east-1) Region
Network Load Balancer (NLB) experienced increased connection errors for some load balancers in the N. Virginia (us-east-1) Region
This was caused by health check failures in the NLB fleet, which resulted in increased connection errors on some NLBs
new EC2 instance launches failed and, while instance launches began to succeed from 10:37 AM, some newly launched instances experienced connectivity issues
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