This exchange, C2CX, was established since December in the year 2016 from Hong Kong which used to serve with high efficiency especially for Chinese as well as Asian cryptocurrency traders and it really gained a lot of users as it grew and became a very popular cryptocurrency exchange but right now, it exchange is no longer accessible because it is now inactive.
After making my researches on this exchange, I discovered that C2CX has been marked as untracked listing on coinmarketcap as well as many other cryptocurrency organizations and I am pretty sure you know what that means. It is now a dead exchange and is no longer serving. In conclusion, my advice for you is that you should try and look for other exchanges that is readily available.