[USR-TC] HiperARC with WindowsXP Connection

Dear experts, We have a strange condition with our HiperDSP/ARC recently. When our customers connect using Windows 9x they could connect like usual. Browsing, email and other function is working properly. But when they use windows XP or windows 2000, they can not use browsing. At windows we detect an ESTABLISH connection with port 80, only the data not transfer to the computer (we indicate it from modem status). The above situation only happen when we use RADIUS authentication. When we use local profile, the windows XP connection working properly. Anyone have the same situation? -mna-