Wall Street Journal's Chinese-language edition has been blocked in China since Aug 3, 2013. It was not clear why the whole website was blocked. The English-language version of the site remains accessible and the Chinese Wall Street Journal's Weibo is still active. Shanghaiist has more details.
Already been unblocked: http://beijingcream.com/2013/08/wsj-says-its-chinese-website-is-not-blocked-in-china/