Single AZ Intermittent DNS Lookup

2:11 AM PDT We are investigating an increase in DNS lookup failures from EC2 instances in a single Availability Zone in the US-EAST-1 Region.

2:57 AM PDT We are continuing to investigate increased DNS resolution errors from EC2 instances in a single Availability Zone of the US-EAST-1 Region. This could also impact functionality of other services that use EC2, such as App Mesh, Cloud9, ElasticSearch, EMR, Managed Blockchain, SageMaker, Transfer for SFTP, WorkMail, and Glue.

3:44 AM PDT We are implementing a mitigation to the increased DNS resolution errors from EC2 instances in a single Availability Zone in the US-EAST-1 Region, and are starting to see recovery. This issue could also impact functionality of other services that use EC2, such as App Mesh, Cloud9, ElasticSearch, EMR, Managed Blockchain, SageMaker, Transfer for SFTP, WorkMail, RDS, and Glue.

4:19 AM PDT DNS resolution failures in a single Availability Zone in the US-EAST-1 Region have largely been mitigated, and we are continuing to work towards full mitigation.

4:37 AM PDT Between 1:22 AM and 4:13 AM PDT, customers experienced an increase in DNS resolution errors from EC2 instances in a single Availability Zone of the US-EAST-1 Region. This could have also impacted functionality of other services that use EC2, such as RDS, SageMaker, EMR, WorkMail, MSK, AWS IoT Analytics Service, Amazon ElasticSearch, Cloud9, AppMesh, Amazon Managed Blockchain, Glue, and AWS Transfer. The issue has been resolved and all DNS queries are being answered normally.