Alexey Alexey - 29 days ago 7x
Ruby Question

The authorization mechanism you have provided is not supported. Please use AWS4-HMAC-SHA256

I get an error

AWS::S3::Errors::InvalidRequest The authorization mechanism you have provided is not supported. Please use AWS4-HMAC-SHA256.
when I try upload file to S3 bucket in new Frankfurt region. All works properly with
US Standard


backup_file = '/media/db-backup_for_dev/2014-10-23_02-00-07/slave_dump.sql.gz'
s3 =
access_key_id: AMAZONS3['access_key_id'],
secret_access_key: AMAZONS3['secret_access_key']

s3_bucket = s3.buckets['test-frankfurt']

# Folder and file name
s3_name = "database-backups-last20days/#{File.basename(File.dirname(backup_file))}_#{File.basename(backup_file)}"

file_obj = s3_bucket.objects[s3_name]
file_obj.write(file: backup_file)

aws-sdk (1.56.0)

How to fix it?

Thank you.


AWS4-HMAC-SHA256, also known as Signature Version 4, ("V4") is one of two authentication schemes supported by S3.

All regions support V4, but US-Standard¹, and many -- but not all -- other regions, also support the other, older scheme, Signature Version 2 ("V2").

According to ... new S3 regions deployed after January, 2014 will only support V4.

Since Frankfurt was introduced late in 2014, it does not support V2, which is what this error suggests you are using. explains how to enable V4 in the various SDKs, assuming you are using an SDK that has that capability.

I would speculate that some older versions of the SDKs might not support this option, so if the above doesn't help, you may need a newer release of the SDK you are using.

¹US Standard is the former name for the S3 regional deployment that is based in the us-east-1 region. Since the time this answer was originally written, "Amazon S3 renamed the US Standard Region to the US East (N. Virginia) Region to be consistent with AWS regional naming conventions." For all practical purposes, it's only a change in naming.