Logout problem in SanAuth

Module_App1

Module.php for App1
<?php
namespace App1;

class Module
{
    public function getAutoloaderConfig(){} /*Common Code*/

    public function getConfig(){} /* Common Code */

    public function getServiceConfig()
    {
        return array(
                'SanAuth\Model\MyAuthStorage' => function ($sm) {
                    return new \SanAuth\Model\MyAuthStorage('zf_tutorial1');
                },
            ),
        );
    }
}

Module_App2

Module.php for App2
<?php
namespace App2;

class Module
{
    public function getAutoloaderConfig(){} /*Common Code*/

    public function getConfig(){} /* Common Code */

    public function getServiceConfig()
    {
        return array(
                'SanAuth\Model\MyAuthStorage' => function ($sm) {
                    return new \SanAuth\Model\MyAuthStorage('zf_tutorial2'); /* changing the zf_tutorial1 to zf_tutorial2 solves the login issue */
                },
            ),
        );
    }
}