AWS continues to work on this issue:
Here is the latest update from AWS:
We continue to experience increased API error rates for multiple AWS Services in the US-EAST-1 Region. The root cause of this issue is an impairment of several network devices. We continue to work toward mitigation, and are actively working on a number of different mitigation and resolution actions. While we have observed some early signs of recovery, we do not have an ETA for full recovery. For customers experiencing issues signing-in to the AWS Management Console in US-EAST-1, we recommend retrying using a separate Management Console endpoint (such as https://us-west-2.console.aws.amazon.com/
). Additionally, if you are attempting to login using root login credentials you may be unable to do so, even via console endpoints not in US-EAST-1. If you are impacted by this, we recommend using IAM Users or Roles for authentication. We will continue to provide updates here as we have more information to share.
Refer to https://status.aws.amazon.com
for more information.