Voice Of China 中国之言

Hi all,
I don't have any Chinese IME at work, so I'm typing English.
I've been having an annoying issue with authentication on our site, I'm wondering if anyone else has the same problem.  The problem is that after I've logged in from the home page, if I click on the Forum link on the top navigation menu, my session will be terminated and I have to log in again.  Once logged in from the Forum section, switching between any other section will not kick me out.  It is really odd, I'm suspecting there might be some configuration errors.
 
Meishizhaoshi