Estoy tratando de enviar mensajes SNS a Android a través de la API web. Descargado e instalado el SDK dehttp://aws.amazon.com/developers/getting-started/php/

Recibí el siguiente error al ejecutar sample.php:

Fatal error: Uncaught exception 'Aws\Common\Exception\InstanceProfileCredentialsException' with message 'Error retrieving credentials from the instance profile metadata server. When you are not running inside of Amazon EC2, you must provide your AWS access key ID and secret access key in the "key" and "secret" options when creating a client or provide an instantiated Aws\Common\Credentials\CredentialsInterface object. ([curl] 28: Connection timed out after 5016 milliseconds [url] http://169.254.169.254/latest/meta-data/iam/security-credentials/)' in C:\xampp\htdocs\aws-php\vendor\aws\aws-sdk-php\src\Aws\Common\InstanceMetadata\InstanceMetadataClient.php:85 Stack trace: #0 C:\xampp\htdocs\aws-php\vendor\aws\aws-sdk-php\src\Aws\Common\Credentials\RefreshableInstanceProfileCredentials.php(52): Aws\Common\InstanceMetadata\InstanceMetadataClient->getInstanceProfileCredentials() #1 C:\xampp\htdocs\aws-php\vendor\aws\aws-sdk-php\src\Aws\Common\Credentials\AbstractRefreshableCredentials.php(54): Aws\Common\Credentials\Refreshable in C:\xampp\htdocs\aws-php\vendor\aws\aws-sdk-php\src\Aws\Common\InstanceMetadata\InstanceMetadataClient.php on line 85

Un poco de orientación sobre este tema me ayudará mucho