刘天池 writes: Dear Tianchi, Our lab experienced a light DDoS-style event a few weeks ago, with tens of thousands of web requests, slowing down our servers to the point that it was difficult for us to work with some of our online services. As each of these requests came from a different IP address in China, our sysadmin decided to ban all traffic from China... He removed the ban yesterday, so hopefully this works for you again. Best regards, Alexandre