Im not able to connect to aws RDS from a laravel 5.4 apllication

this is my database.php i declared these rds variables correctly in .env file I got this error No connection could be made because the target machine actively refused it.

'connections' => [

    'sqlite' => [
        'driver' => 'sqlite',
        'database' => env('DB_DATABASE', database_path('database.sqlite')),
        'prefix' => '',
    ],

    'mysql' => [
        'driver' => 'mysql',
        'host' => env('RDS_DB_SERVER'),
        'port' => env('RDS_DB_PORT'),
        'database' => env('RDS_DB_DATABASE'),
        'username' => env('RDS_DB_USERNAME'),
        'password' => env('RDS_DB_PASSWORD'),
        'unix_socket' => env('DB_SOCKET', ''),
        'charset' => 'utf8mb4',
        'collation' => 'utf8mb4_unicode_ci',
        'prefix' => '',
        'strict' => true,
        'engine' => null,
    ],

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