Ruby Amazon S3 Access Denied al listar cubos

Ruby Newb aquí.

Me dieron credenciales de acceso a los datos en la nube de Amazon. Estoy empezando a pensar que las teclas de acceso están desactivadas, pero podría estar equivocado. Alguien ayuda!

Tengo la carpeta aws como plugin

>> Version
=> "0.6.3"

>> AWS::S3::Base.establish_connection!(:access_key_id =>'*******', :secret_access_key => '*****')
=> #<AWS::S3::Connection:0x007fd0539bb4c0 @options={:server=>"s3.amazonaws.com", :port=>80, :access_key_id=>"****", :secret_access_key=>"****"}, @access_key_id="****", @secret_access_key="****", @http=#<Net::HTTP s3.amazonaws.com:80 open=false>>

>> AWS::S3::Service.buckets   
=> AWS::S3::AccessDenied: Access Denied

from /Users/PBR/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/aws-s3-0.6.3/lib/aws/s3/error.rb:38:in `raise'
from /Users/PBR/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/aws-s3-0.6.3/lib/aws/s3/base.rb:72:in `request'
from /Users/PBR/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/aws-s3-0.6.3/lib/aws/s3/base.rb:88:in `get'
from /Users/PBR/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/aws-s3-0.6.3/lib/aws/s3/service.rb:21:in `buckets'
from /Users/PBR/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/aws-s3-0.6.3/lib/aws/s3/extensions.rb:183:in `block in buckets'
from /Users/PBR/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/aws-s3-0.6.3/lib/aws/s3/extensions.rb:152:in `expirable_memoize'
from /Users/PBR/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/aws-s3-0.6.3/lib/aws/s3/extensions.rb:182:in `buckets'

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