Here are some tips that have been fixing the issue to some players:
- Disable Anti-Virus
- Disable Firewall
- Restarting the rooter
By the way if you use anything related with Logitech LogiCool/Setpoint Software make sure you disable it / remove everything related with it, since this can get you banned.
Read this thread for more info.
Give an eye on this thread too, hopefully it can also help you.
Really hope this helps you.
If nothing works don't hesitate to reply in this thread!
If anything worked please reply in this thread aswell saying you got your issue fixed.