Getting authentication cookie after login_verify_success

[jaz6ix]

I need to be able to get an authentication cookie after login_verify_sucess so I can send it to another server for authentication. Here is my code so far that gets executed when somone logs in:

PHP Code:

$ch = curl_init("http://server2.example.com/User?action=login&session=".$_COOKIE['bb_sessionhash']."&username=".$vbulletin->userinfo['username']);

curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

@curl_exec($ch);
curl_close($ch); 


Problem 1: When I log in using facebook connect, $_COOKIE['bb_sessionhash'] sent to the server2 and the bb_sessionhash cookie I see under browser option are different.

Problem 2: When I log in using forum username and password $_COOKIE['bb_sessionhash'] is blank while bb_sessionhash is set under browser options.

Thank you in advance.