AWS S3 Snapshot behind proxy error

[gromit]

Currently using ES 2.4.3 with cloud-aws plugin version 2.4.3

Proxy settings in elasticsearch.yaml set on all nodes:

cloud:
aws:
    protocol: https
    proxy:
        host: proxy1.company.com
        port: 8083
        username: myself
        password: theBestPasswordEver!

PUT request for repo:

PUT _snapshot/my_s3_repository

{
"type": "s3",
"settings": {
"bucket": "my_bucket_name",
"region": "us-west"
}
}

Error is:

amazon_s3_exception - Proxy Authentication Required - Error Code 407

Is there some way to debug this, the logs don't seem to show much.

[dadoonet (David Pilato)]

You are missing an indentation before aws.

Can you check?

[gromit]

Thanks, it does have an indent, I just pasted here incorrectly.
I've checked the elasticsearch.yaml files with LINT and they are valid.
Not sure if this is relevant, but the username is in the form domain\username, so I entered it in the form domain%5Cusername as it's an HTTP proxy, which is how it's setup in local environment settings.

[dadoonet (David Pilato)]

Can you try:

domain\\username