This article was updated at 6:15 p.m. PDT on October 20.

Between 11:49 PM PDT on October 19 and 2:24 AM PDT on October 20, AWS experienced increased error rates for AWS services in the US-EAST-1 Region, which also impacted Amazon.com and Amazon subsidiaries, as well as AWS Support operations. By 12:26 AM PDT on October 20, we determined that the event was the result of DNS resolution issues for the regional DynamoDB service endpoints, and mitigated the issue by 2:24 AM PDT. After resolving the DynamoDB DNS issue, AWS services began recovering, but a small subset of internal subsystems continued to be impaired. To facilitate full recovery, we temporarily throttled some impaired operations such as EC2 instance launches. By 12:28 PM PDT, many AWS customers and AWS services were seeing significant recovery. We continued to reduce throttling of EC2 new instance launch operations while we worked to mitigate the remaining impact. By 3:01 PM PDT, all AWS services returned to normal operations. Customers should continue to refer to the AWS Health Dashboard for the latest information: https://health.aws.amazon.com/health/status

A detailed post-event summary is now available: https://aws.amazon.com/message/101925/