AWS has identified increased error rates with S3 in US-EAST-1, which is impacting applications and services dependent on S3. They are actively working on addressing the issue. Please see https://status.aws.amazon.com/
for additional details.
Note that some RightScale services may be dependent on this service (such as uploading CAT files). You may experience intermittent errors during the time that AWS is working to address this issue. The impact on our services has been minimal, but if you have any questions please reach out to firstname.lastname@example.org