Addition: On PC is Opera Developer. And datas on www.sync.opera.com maybe not the really sync datas, because Opera Stable could synchronize the correct datas.

A few days before, I find the sync server for bookmarks is not working. Then I logged out, and relogged in. The pages noticed I've logged seccessfully, but the browser's menu is allways noticing just in logging. The sync cannot be opened. Opera on Android noticed everything is ok, but the pages www.sync.opera.com tells me my datas was not be synchronized successfully. I know addons was banned by opera in China a few weeks ago, but I using another IP in other countries like the USA is also not worked. The sync server could not be recovered.

Why I can't sign in on my PC? In the same network, I can sign in on my phone. I can open the "Sign in" pages on PC, but I can't sign in, neither on Windows or Linux.
P.S. I live in China. Opera Software has been aquired by Chinese capital, why not set up severs in China. Opera software could set up servers on 360's cloud. Then, we won't bear such a problem in China. As we all know, Chinese law asks any company to make dates staying internal. Doesn't Opera software wanna any market here?