I agree with both HnK and Guest above. I also suddenly started having problems in November after using Astrill for several months in China. I talked to their support numerous times, but every time would get different people, most of whom seemed to have limited knowledge of the challenges here in China, and who would all give me similar advice to try the same 3 or 4 things I'd already tried numerous times. I suspect Astrill is going the way of every other VPN in China--the more successful they are, the quicker the guardians of the Great Firewall will figure it out and start shutting down ports, and/or throttle the speed going to certain IP addresses, basically whatever they can do to make using a VPN as inconvenient as possible. I think the Internet controllers here have become more sophisticated now, and may not use the method of completely blocking a VPN service; rather, while you can still sign on, they now throttle your speed to the point it is almost unusable.