User blog comment:Dragonjet/KC3改/@comment-36.71.86.66-20150724045054/@comment-26091666-20150724051519

There was a similar report here but no hints of using a viewer were noted: Tutorial:_Proxy_Connection

You may also want to try playing the game without using a viewer at first and see if that helps. Also try clearing the cache completely (not just clearing cookies) and manually insert region cookie by hand.