Hello. I've got a problem. I hope you'll help me to solve it. I'm creating chat with LONG POLLING. To keep main domain ajax requests (send message) untouched (unqueued), I had to put my long-polling script to subdomain. So I've got 2 "domains" foo.cz channel.foo.cz I do not mind about any Same Origin Policy right now as I put header("Access-Control-Allow-Origin: *"); at top of that script. I also do use ini_set('session.cookie_domain', '.foo.cz'); in all scripts (sending, receiving, chatting room). For debugging, i've got this in my channel.foo.cz/getNews.php: print_r($_SESSION); print_r($_COOKIE); die(); My problem is: 1. I do load chatting room 2. Ajax (jquery) requests channel.foo.cz/getNews.php 3. getNews.php returns this: array()array() 4. It look that cookies and session isn't setted up. But! If I look into my FF cookie browser, I do see that domain for these cookies set in chatRoom is .foo.cz 5. If I try to copy ajax request uri and paste it into browser url, it returns me array([username] => martin)array([SESSID] => some1D65a4s6d54asd) How is that possible? Sorry for long question and thanks for all answers!