public function logoffAction()
    {
        $this->addMessage(sprintf($this->_('Good bye: %s.'), $this->currentUser->getFullName()));
        $this->accesslog->logChange($this->getRequest());
        $this->currentUser->unsetAsCurrentUser();
        \Zend_Session::destroy();
        $this->_reroute(array('action' => 'index'), true);
    }