They said on twitter that their team are working on it
https://twitter.com/hitbtc/status/941265063087955973I thought Cloudfare were supposed to protect them from DDoS
Even their API are down
Times without number this has been said and I will repeat it move your funds away from exchange so that you don't give yourself High blood pressure over technical glitch or even a shut down completely. I use HiBTc (and several other people including the poser after you but his response seems calmer) for my trading activities but I don't even know whether they shut down or doing maintenance because my life is not dependent on their continued operation but people like you wont listen and I am sure if same thing should happen tomorrow, you run to the forum to get answers. Protect yourself before its too late. No exchange site is the safest.
This.
Never, ever, store a large sum of cryptocurrency on Cloud based storage, its never safe