This was a temporary problem due to a AWS DNS Resolution issue[1], but it seems to be back now. Do you confirm?
http://status.aws.amazon.com/ [1] 3:42 PM PDT We are investigating DNS resolution issues in the US-EAST-1 Region.
http://status.aws.amazon.com/ [1] 3:42 PM PDT We are investigating DNS resolution issues in the US-EAST-1 Region.