The known conditions:
1. The routing configuration is good, because cell phones and other devices can normal Internet access;
2. The DNS can ping, the gateway can ping;
3. The winsock has been reset;
4. Other browsers can't open, in addition to firefox;
5. Steam also won't open, VPN, accelerating nor even;
6. Not even QQ computer keeper, 360 safe

For big cafe, how in under the premise of not reshipment system, let the normal program online!!!!!!