$this->Session->read('Config') prints nothing in cakephp - php

Question

while I try to print $this->Session->read('Config') , it prints nothing.
I am using cakephp 2.5.3
I searched from net ,read many blogs, posts and comments and tried to solve it out but my problem still persists.Though $this->Session->setFlash() works fine but other session values are not working.
App::uses('Controller', 'Controller');
class AppController extends Controller {
var $components = array('Session','RequestHandler');
public function beforeFilter() {
parent::beforeFilter();
debug($this->Session->read('Config'));//null
debug($this->Session->read('Config.userAgent'));//null
debug($this->request->clientIp());// ::1
}
}

Answer 1

please check that at the time of login you create a session or not.
that is $this->Session->write('variable name','variable value').
if you didn't do this you will get null through your code.
the same code give me information about logged-in user in my system.
So be sure that you have created a session,
at the time of login with some variable name and value combination.
please have a look on this:-
public function login() {
if ($this->request->is('post') || $this->request->is('put')) {
$user_detail = $this->User->find('first',array('conditions'=>array('username'=>$this->request->data['User']['username'], 'password'=>$this->Auth->password($this->request->data['User']['password'])),'recursive'=> -1,'fields'=>array('deleted'))); // gettin user details
if(isset($user_detail) && !empty($user_detail)){
if($user_detail['User']['deleted']== '0'){
if ($this->Auth->login()) {// checking user is authorize for login or not?
$this->Session->write('user_role', $this->Auth->user('role_id'));// if yes create session variable with the given variable name and value.
$is_incharge = $this->check_incharge($this->Auth->user('id'));
if ($is_incharge) {
$this->Session->write('is_user_incharge', true);
} else {
$this->Session->write('is_user_incharge', false);
}
$this->redirect($this->Auth->loginRedirect);
} else {
$this->Session->setFlash(__('Invalid User name or Password.'));
$this->redirect($this->Auth->logoutRedirect);
}
}else{
$this->Session->setFlash(__('You are deleted.Can not login.'));
$this->redirect($this->Auth->logoutRedirect);
}
}else{
$this->Session->setFlash(__('Invalid User name or Password..'));
$this->redirect($this->Auth->logoutRedirect);
}
}
}