So the problem is boto switched to the AWS version 4 signature scheme:
http://docs.aws.amazon.com/general/latest/gr/signature-version-4.html
But we currently expect version 2 signature format (not sure what happened to version 3, no mention on the AWS site):
http://docs.aws.amazon.com/general/latest/gr/signing_aws_api_requests.html
So the problem is boto switched to the AWS version 4 signature scheme:
http:// docs.aws. amazon. com/general/ latest/ gr/signature- version- 4.html
But we currently expect version 2 signature format (not sure what happened to version 3, no mention on the AWS site):
http:// docs.aws. amazon. com/general/ latest/ gr/signing_ aws_api_ requests. html