The site wont be ready for another 6 hours from now.
Try again after 6 hours later.
The website is live but unfortunately the option to order is not... According to @pangolinminer twitter account M3 March batch was also going to be available today after maintenance, is that still scheduled?
There is now a live countdown on their website. It says that next sales will start in 18 hours 49 minutes and 25 seconds (I tried to time that message perfectly). There is also an announcement that it will happen 2017/12/22 13:30:00, maybe its in Chinese time.