Possible Duplicate:
How do I use cookies across two different domains?
Can you please tell me what is the easiest way to transfer cookies from one domain to another on different servers?
I have a website and a forum on different servers and different domains. I’ve already created the bridge between them regarding users.
Thanks.
You could do a an Ajax call from one server to the other, and rebuilding the session on the other server.
To use cross domain you need to use JsonP. Take a look here: http://api.jquery.com/jQuery.ajax/
This way, the site does do a request as the user, so the cookie/session does exists on the other server, and therefore you can set a new one.