Multiple database connection failed, PDOException in Connector.php line 47 SQLSTATE[HY000] [2002] A connection attempt failed

I am trying to connect remote database from my localhost, the cause of I want to store data localhost to remote server. Now I want to show simply users table info it get form my localhost and different variable show remote server users table info . I write the code example here :

In my Config/database.php:

'mysql' => [
        'driver'    => 'mysql',
        'host'      => env('DB_HOST', 'localhost'),
        'database'  => env('DB_DATABASE', 'realstate'),
        'username'  => env('DB_USERNAME', 'root'),
        'password'  => env('DB_PASSWORD', ''),
        'charset'   => 'utf8',
        'collation' => 'utf8_unicode_ci',
        'prefix'    => '',
        'strict'    => false,
    ],

    'shahin' => [
        'driver'    => 'mysql',
        'host'      => env('DB_HOST', '104.219.248.3'),
        'database'  => env('DB_DATABASE', 'laraveldb'),
        'username'  => env('DB_USERNAME', 'laraveldb_username'),
        'password'  => env('DB_PASSWORD', 'secret'),
        'charset'   => 'utf8',
        'collation' => 'utf8_unicode_ci',
        'prefix'    => '',
        'strict'    => false,
    ],

In Route.php :

Route::get('mpdb',function(){
$userArray = DB::table('users')->get();
echo "<pre>";
print_r($userArray);
echo "</pre><br>";           
$users2 = DB::connection('shahin');
$u = $users2->table('users')->get();
echo "<pre>";
print_r($u);
});

Local Database work's properly but Remote database get error!!

ERROR : SQLSTATE[HY000] [2002] A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.

via Chebli Mohamed