ECS IAM role not working

[FedorMutovin-flatstack]

I'm trying to run the ecs task with this config:

config.fog_provider = 'fog/aws'
config.fog_credentials = {
        provider: 'AWS',
        use_iam_profile: true,
        region: ENV["AWS_REGION"]
      }
config.fog_attributes = { 'x-amz-server-side-encryption' => 'AES256' }
config.fog_directory = ENV["BUCKET"]

and keep getting this error

[fog][WARNING] Unable to fetch credentials: Invalid argument - connect(2) for 169.254.169.254:80 (Errno::EINVAL)
/home/user/app/vendor/bundle/ruby/2.7.0/gems/fog-core-2.2.3/lib/fog/core/service.rb:244:in `validate_options': Missing required arguments: aws_access_key_id, aws_secret_access_key (ArgumentError)

but I see that I can get credentials by curl 169.254.170.2$AWS_CONTAINER_CREDENTIALS_RELATIVE_URI and I'm not clear on what connect(2) argument might mean in this case.

[geemus]

I'm not sure off hand. Looking at what you have here it looks like fog is trying to connect to 169.254.169.254:80 vs curl which appears to be using 169.254.170.2. The different in the 4th group and the explicit port could both be sources of the differences. I don't have any direct experience with using ECS this way though, so it's all a bit speculative from my perspective. Could those issues be part of the problem, or maybe it's something else altogether?