After update to Win 8.1 from Win 8. None of browser works, while other app can access to public network. This is a bug of this update.
The solution is very easy:
1. Win key + "f" to search "everywhere", you will see "command prompt ". Right click "run as administrator". 2. In command line, type in "netsh winsock reset", return.
3. Actually you have done everything, although it is said "you need to restart you PC". But you really don't need, or only need to restart your browser.
