It's been for days that I couldn't connect to Google's services smoothly. I can't find any news reports talked about it, that seems to be my own problem.

My ISP is Hinet, the biggest ISP in Taiwan. This situation happened two or three times in the last few years, but all got resolved in hours except that an earthquake broke sea cables.

I didn't use proxy before, so I use Hinet's proxy server and didn't help. Then I tried to access an image from free image hosting service (xs.to), the proxy responded "host can't be resolved." That explains why I saw the error so many times in the last few days. At first, I thought those were remote servers' problems. Now, it's obvious that the problem is the nameservers.

I am using OpenDNS and all problems are gone.