Before filter, the session falls

Well,
I've a big big problem with two applications of mine. I use an
authentication method made with before filter.
The problem is that, after a login it works correctly. Then, without a
reason, the application seems to loose the session and brings me back
to the login form. For this reason, I really can't understand what
happens and when. Is there a way to produce a log for the application?
Or otherwise, how I can unserstand what happens? That's the code in
app_controller.php:

function checkSession()
{
// If the session info hasn't been set...
if (!$this->Session->check('Dealer'))
{
// Force the user to login
$this->redirect('/dealers/login');
exit();
}
}

And this in dealer_controller.php

function login()
{
//Don't show the error message if no data has been submitted.
$this->set('error', false);

// If a user has submitted form data:
if (!empty($this->data))
{
// First, let's see if there are any users in the database
// with the username supplied by the user using the form:

$someone = $this->Dealer->findByUsername($this-
>data['Dealer']['username']);

// At this point, $someone is full of user data, or its
empty.
// Let's compare the form-submitted password with the one
in
// the database.

if(!empty($someone['Dealer']['username']) &&
$someone['Dealer']['password'] == $this->data['Dealer']['password'])
{
// Note: hopefully your password in the DB is hashed,
// so your comparison might look more like:
// md5($this->data['User']['password']) == ...

// This means they were the same. We can now build
some basic
// session information to remember this user as
'logged-in'.

$this->Session->write('Dealer', $someone['Dealer']);

// Now that we have them stored in a session, forward
them on
// to a landing page for the application.

$this->redirect('/customers/index_search');
}
// Else, they supplied incorrect data:
else
{
// Remember the $error var in the view? Let's set that
to true:
$this->set('error', true);
}
}
}

function logout()
{
// Redirect users to this action if they click on a Logout
button.
// All we need to do here is trash the session information:

$this->Session->delete('Dealer');

// And we should probably forward them somewhere, too...

$this->redirect('/dealers/login');
}

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