Steve Loughran commented on HADOOP-14620:

I've now got a diagnostics tool to help diagnose these config problems: 

Grab the latest one there, and run it against your bucket. It will look at what 
values are coming in, attempt to make a basic http/https call first to see what 
happens, then spins up an FS instance. Please can you use that to see what's up 
with your config.

closing as a WORKSFORME

> S3A authentication failure for regions other than us-east-1
> -----------------------------------------------------------
>                 Key: HADOOP-14620
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14620
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs/s3
>    Affects Versions: 2.7.3
>            Reporter: Ilya Fourmanov
>            Priority: Minor
>             Fix For: 3.1.0
>         Attachments: s3-403.txt
> hadoop fs s3a:// operations fail authentication for s3 buckets hosted in 
> regions other than default us-east-1
> Steps to reproduce:
> # create s3 bucket in eu-west-1
> # Using IAM instance profile or fs.s3a.access.key/fs.s3a.secret.key run 
> following command:
> {code}
> hadoop --loglevel DEBUG  -D fs.s3a.endpoint=s3.eu-west-1.amazonaws.com  -ls  
> s3a://your-eu-west-1-hosted-bucket/ 
> {code}
> Expected behaviour:
> You will see listing of the bucket
> Actual behaviour:
> You will get 403 Authentication Denied response for AWS S3.
> Reason is mismatch in string to sign as defined in 
> http://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAuthentication.html 
> provided by hadoop and expected by AWS. 
> If you use https://aws.amazon.com/code/199 to analyse StringToSignBytes 
> returned by AWS, you will see that AWS expects CanonicalizedResource to be in 
> form  
> /your-eu-west-1-hosted-bucket{color:red}.s3.eu-west-1.amazonaws.com{color}/.
> Hadoop provides it as /your-eu-west-1-hosted-bucket/
> Note that AWS documentation doesn't explicitly state that endpoint or full 
> dns address should be appended to CanonicalizedResource however practice 
> shows it is actually required.
> I've also submitted this to AWS for them to correct behaviour or 
> documentation.

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