S3 Backup Connection reset by peer

I have my S3 and user account (for the access key and secret key) managed by Terraform. From that, I’m able to grab the access key and secret key once created. I use the admin UI to set the region, bucket name & path, and access / secret key. The UI accepts the values with an “OK” modal. However, the backup itself fails. I have attached the error message from a manual backup attempt as well as the bucket policy for the user account whose access and secret key I'm using.

ubuntu@mail:~/mailinabox/management$ sudo ./backup.py Attempt 1 failed. error: [Errno 104] Connection reset by peer Attempt 2 failed. error: [Errno 104] Connection reset by peer Attempt 3 failed. error: [Errno 104] Connection reset by peer Attempt 4 failed. error: [Errno 104] Connection reset by peer Giving up after 5 attempts. error: [Errno 104] Connection reset by peer Traceback (most recent call last): File “./backup.py”, line 561, in perform_backup(full_backup) File “./backup.py”, line 279, in perform_backup get_env(env)) File “/home/ubuntu/mailinabox/management/utils.py”, line 123, in shell ret = getattr(subprocess, method)(cmd_args, **kwargs) File “/usr/lib/python3.6/subprocess.py”, line 311, in check_call raise CalledProcessError(retcode, cmd) subprocess.CalledProcessError: Command ‘[’/usr/bin/duplicity’, ‘full’, ‘–verbosity’, ‘warning’, ‘–no-print-statistics’, ‘–archive-dir’, ‘/home/user-data/backup/cache’, ‘–exclude’, ‘/home/user-data/backup’, ‘–volsize’, ‘250’, ‘–gpg-options’, ‘–cipher-algo=AES256’, ‘/home/user-data’, ‘s3://s3.us-east-2.amazonaws.com/vibravid-email-storage/ms’, ‘–allow-source-mismatch’, “–ssh-options=’-i /root/.ssh/id_rsa_miab’”, ‘–rsync-options=-e “/usr/bin/ssh -oStrictHostKeyChecking=no -oBatchMode=yes -p 22 -i /root/.ssh/id_rsa_miab”’]’ returned non-zero exit status 50.

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "s3:*"
            ],
            "Resource": [
                "arn:aws:s3:::my-bucket-name"
            ]
        },
        {
            "Action": [
                "s3:*"
            ],
            "Effect": "Allow",
            "Resource": [
                "arn:aws:s3:::my-bucket-name/*"
            ]
        }
    ]
}

mail-in-a-box / mailinabox

S3 Backup Connection reset by peer #1631