Auth:check() always returns false

I tried googling but didn't get the solution yet.

I'm trying to know whether user is authenticated or not into the view file by using

1. Auth::check() always returns false
2. Auth::User() always returns NULL

Tried posts:

1. It says to place domain to null that's already there.

2. Some posts say to edit into the kernel.php, how safe is it?

Any help will be appreciated. Thanks

via Chebli Mohamed