Session not working

Hi there, I'm facing some issues with session. After login in and redirecting to the homepage, my session isn't working. If I do dd((Auth::check()) before redirecting, session is ok but I do this after redirecting session is not working at all. Here is some parts of my code: Route:

Route::get('/', function()
{
    return View::make('accueil');
});
Route::controller('users', 'UsersController');

Users controller

public function postLogin() {
    if (Auth::check()) {
        Session::flash('message', 'Vous êtes déjà connecté.');
        return Redirect::to('/');
    }
    $user = array(
        'pseudo' => Input::get('pseudo'),
        'password' => Input::get('password')
    );
    if (Auth::attempt($user)) {
        /*Session::flash('message', 'Vous êtes connecté.');*/
        return Redirect::to('/');
    } else {
        Session::flash('message', 'Vos identifiants ne sont pas corrects.');
        return Redirect::back();
    }
}

Thanks in advance and sorry if i'm doing some mistakes, english isn't my native language