session is not working between different actions on different controllers

Hi all,

i have 2 cake apps. localhost/wp and localhost/checkout. wp sends a
httpsocket->post to localhost/checkout/carts/add and gets a result.
the carts/add will set a session value. wp will use the result of the
post and redirects to paypalsandbox. after that the paypalsandbox will
redirect to localhost/checkout/orders/pay. however in orders/pay it
cannot find the session written in carts/add

http://picasaweb.google.com/lh/photo/o_Ylvp3uqtQer-d5HC9Lgg?feat=directlink
describes my situation

i have tried setting security to low

changing to database for my session

changing to custom handler where the referer_check is empty string

change session cookiename

change checkAgent to false

so if you have any other methods, please please tell me.

i am really stuck.

i am not sure if this is due to the paypal page redirecting? or due to
the fact that the place where i first write the session value i am
used a httpsocket post.

Please advise. thank you.

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