nlapiOutboundSSO and NetSuiteService C# object

Hi there,

I'm looking for a savior, I reached to get a handshake cookiecontainer form a nlapiOutboundSSO request to my webservice in C#.

Prior to that I was feeding my NetSuiteService object with Passport credentials.

I then tried something like this:
NetSuiteService service = new NetSuiteService();
service.CookieContainer = cookie_receivedfromthehandshakeprocess;

No exception but whenever I try to use a method in service it throws that my session has expired and I must log again

So close form the goal it's a bit annoying, do you guys have a clue upon that?

BR