session between domain and subdomain

[javismiles]

Hi,
i have a domain.com and a secure.domain.com subdomain,
i need to share php session variables between them,

The code i use is
<?php
ini_set('session.cookie_domain', '.domain.com' );
$some_name = session_name("domain");
session_set_cookie_params(0, '/', '.domain.com');
session_start();

This code works great in other hosts of friends and both session id and session variables are being shared

in the case of my plesk 11.5 centos 6 server, the session id is being preserved but the session variables are not,
the session variables are not passing between subdomain and domain

Seems to be a plesk server issue, as the code itself works in other servers

could you please help me

thank you