> [This trouble really happened.]
> 
> Now, you foreigner must be connected to poj via Chinese proxy.
> And there is a serious problem, when you use poj system.
> 
> Some data that you accessed poj are left to the proxy server's cache.
> If somebody will access it through proxy same as you,
>  your personal information left to a server may be seen.
> 
> I think poj can not control to proxy server's cache.
> Therefore a foreigner using Chinese proxy has to be careful till poj completely revives!!