Error Creating S3 Repository

[Ben_GSP (Ben Field)]

I'm getting the following error when attempting to create a new s3 repository:

{
  "error": {
    "root_cause": [
      {
        "type": "repository_exception",
        "reason": "[s3_01] Could not determine repository generation from root blobs"
      }
    ],
    "type": "repository_exception",
    "reason": "[s3_01] Could not determine repository generation from root blobs",
    "caused_by": {
      "type": "i_o_exception",
      "reason": "Exception when listing blobs by prefix [index-]",
      "caused_by": {
        "type": "sdk_client_exception",
        "reason": "Failed to connect to service endpoint: ",
        "caused_by": {
          "type": "socket_timeout_exception",
          "reason": "Connect timed out"
        }
      }
    }
  },
  "status": 500
}

I have:

• Installed the S3 plugin on all nodes, and restarted each node.
• Set s3.client.default.access_key and s3.client.default.secret_key using elasticsearch-keystore command.
• Reloaded secure settings.
• Successfully tested uploads to the bucket with s3cmd using the access key and secret key I have set.

I'm using the most basic call with minimal settings:

curl -XPUT https://my_es_node:9200/_snapshot/s3_01 -H 'Content-Type: application/json' -d '{
  "type": "s3",
  "settings": {
    "bucket": "my_bucket_name"
  }
}'

Any help would be appreciated.