http://www.theverge.com/2014/10/20/7013409/china-is-staging-a-nationwide-attack-on-icloud

"Because the attack is taking place at the level of the Great Firewall, it seems likely that this is an attack by Chinese authorities meant to harvest usernames and passwords.

...

If you're using Firefox or Chrome, you'll land on a warning page like the one above, but if you're using Qihoo, the most popular browser in China, you'll be routed straight to the dummy site with no indication that it's not being run by Apple. A similar attack is also being leveled against Microsoft's Login.live.com, the company's gateway for all account logins"