Subdomain Routing Results in ERR_CONNECTION_TIMED_OUT

I want to implement a feedback section in my Laravel 5.1 app. I want the feedback implemented in a subdomain like feedback.my.app. I've gotten so far:

Route::group(['domain' => "feedback.my.app"], function() {
    Route::get('/', [
        'uses' => 'FeedbackController@index'
    ]);
});

Now, if I head to the browser and head to the url: feedback.my.app I get a ERR_CONNECTION_TIMED_OUT error in the browser.

php artisan route:list shows that the route is setup correctly:

| Domain                  | Method   | URI |  Name | Action                                        |
--------------------------------------------------------------------------------------------------
| feedback.my.app         | GET|HEAD | /   |       | App\Http\Controllers\FeedbackController@index 

What could I be missing?

via Chebli Mohamed