SIngle sign-on two different applications

Greetings,

i am trying to implement single sign on to multiple applications hosted 
on different systems ... i.e. www.site1.com , www.site2.com

I have an action at www.site1.com that the customer logins. At that time 
i make a request to www.site2.com to a specific action that sets a 
cookie like :
            ActionContext ctx = ActionContext.getContext();
                Map mysession = ctx.getSession();
                mysession.put("code", code);

The problem is that the cookie is not set. Does anyone have any idea ? I 
think it has to do with the browser that i am not making the request 
directly ...

All opinions are highly appreciated.

Thank you very much

Leonidas

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