CodeIgniter 3 session regenerated after login in Firefox - codeigniter

Question

After login, I set session with user id and some information. It works very well on Google Chrome.
But it is redirect to login page after login on Firefox. I don't know what is the problem. Furthermore, the strange issue is this is working well on my local server like 127.0.0.4. This redirect issue is occurred on live server(hostinger) and only on Firefox.
Here is my config.php
$config['sess_driver'] = 'files';
$config['sess_cookie_name'] = 'eq_session';
$config['sess_expiration'] = 7200;
$config['sess_encrypt_cookie'] = TRUE; // JFRH
$config['sess_table_name'] = 'eq_sessions'; // JFRH
// $config['sess_save_path'] = NULL;
$config['sess_save_path'] = FCPATH . 'public/sess';
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = FALSE;
$config['sess_match_useragent'] = FALSE;
And this function is customized library for authentication.
public function sess_validate($redi = FALSE, $sess_upda = FALSE) {
$CI =& get_instance();
if ($CI->session->userdata('sess_id')) {
//Preguntar si la variable de sesión 'usua' existe o si se requiere
//que los datos de la misma sean actualizados
if ((!$CI->session->userdata('usua')) || ($sess_upda == TRUE)) {
$this->__sess_update();
}
return TRUE;
} else {
if (!$redi) {
return FALSE;
} else {
print "<script> window.location.href = '". base_url('auth')."'; </script>";
}
}
}
I set session data in my Auth Controller like this.
$this->session->set_userdata('sess_id', $usua->id_usu);
$this->session->set_userdata('sess_na', $usua->nom_usu . " " . $usua->ape_usu);
$this->session->set_userdata('sess_log', $usua->log_usu);
I have tested with changed session path.

Answer 1

I have fixed this.
Here are my config.php.
$root = "http://".$_SERVER['HTTP_HOST'];
As you can see, I was set the root like above line.
It works on my local server but server protocol was https when I deploy this on server. It is a cause of this problem.
So I fixed this like this.
$protocol = stripos($_SERVER['SERVER_PROTOCOL'],'https') === 0 ? 'https://' : 'http://';
$root = $protocol . $_SERVER["HTTP_HOST"];
$root .= str_replace(basename($_SERVER['SCRIPT_NAME']),"",$_SERVER['SCRIPT_NAME']);
$config['base_url'] = $root;
Now, works fine.