I'd like the Session to timeout on browser exit, is this all that's needed?

In Config/core.php...
 
   Configure::write('Session', array(
        'defaults' => 'php',
                'cookieTimeout' => '0'
    ));

Do I have to do anything else for my Session variables to stay alive until the user closes the browser? I ask if I'm missing a step because is seems like the Session is randomly clearing.

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