I'm assuming your username's and passes's are matching.
What function are you calling to get the error?
This here is supposed to grab the info from up there. It does so properly and tries to connect but i receive the error i posted up top.
require_once('jsonRPCClient.php');
$bc = new jsonRPCClient('http://' . $rpc_user . ':' . $rpc_pass . '@' . $rpc_host . ':' . $rpc_port);