It appears that Amazon Web Services are experiencing major outages - http://status.aws.amazon.com/ . According to TechCrunch, a number of web services are affected. Unfortunately, we are among them. Our techs are working in close contact with AWS specialists in order to mitigate the issue. We'll keep you updated on any progress made.
P.S. Amazon has resolved their issues and the service is back to normal. We are sorry for any inconveniences this may have caused.