S3 putObject not working access denied - amazon-web-services

Question

AWS S3 is working on my localhost and on my live website, but my development server (which is EXACTLY the same configuration) is throwing the following error: http://xxx.xx.xxx.xxx/latest/meta-data/iam/security-credentials/resulted in a404 Not Found` response: Error retrieving credentials from the instance profile metadata server.
Localhost URL is http://localhost/example
Live URL is http://www.example.com
Development URL is http://dev.example.com
Why would this work on localhost and live but not my development server?
Here is my sample code:
$bucket = 'example'
$s3Client = new S3Client([
'region'=>'us-west-2',
'version'=>'2006-03-01',
'key'=>'xxxxxxxxxxxxxxxxxxxxxxxx',
'secret'=>'xxxxxxxxxxxxxxxxxxxxxxxx',
]);
$uniqueFileName = uniqid().'.txt';
$s3Client->putObject([
'Bucket' => $bucket,
'Key' => 'dev/'.$uniqueFileName,
'Body' => 'this is the body!'
]);
Here is policy:
{
"Version": "2012-10-17",
"Id": "Policyxxxxxxxxx",
"Statement": [
{
"Sid": "Stmtxxxxxxxxx",
"Effect": "Allow",
"Principal": "*",
"Action": "s3:GetObject",
"Resource": "arn:aws:s3:::example/*"
}
]
}

Answer 1

The values returned by http://169.254.169.254/latest/meta-data/iam/security-credentials/ are associated with the Role assigned to the EC2 instance when the instance was first launched.
Since you are receiving a 404 Not Found response, it is likely that your Development server does not have a Role assigned. You can check in the EC2 management console -- just click on the instance, then look at the details pane and find the Role value.
If you wish to launch a new server that is "fully" identical, use the Launch More Like This command in the Actions menu. it will also copy the Role setting.