access from china got crash page

it is funny to access site
from singapore, the website is fine,
but from china, got crash page:

Not Found
The requested URL / was not found on this server.
Apache/2.4.7 (Ubuntu) Server at Port 80
Hi Wang,
I was thinking it might be some censorship, but it doesn't look like it.
Ubuntu Server?
Does outsystems website use CDN service? think CDN caused this problem.
I just try to ping website:
Pinging [] with 32 bytes of data:
Wang, yes OutSystems uses CDN.

I don't see any reason why China would censor OutSystems   Could this be also related to AWS? If Amazon can get through, then probably OutSystems will do also? 

I guess this is what some would call "The Great Firewall" of China. Hopefully we can get through sometime soon, lots of opportunities there.

This is something unusual. My team has developers from China and they never experienced problems in accessing from China.