Just got information, turn off your firewall. It's the cause. Either than or allow the following:
Only if your firewall blocks outbound traffic do you need to enable this traffic:
TCP:
Allow traffic to all destinations on ports: 28910, 29900, 29901, 29920, 80, and 443
UDP:
Allow all traffic to all destinations. (Necessary for peer-to-peer connections and game play). The Network Test tool can be used from a computer behind your firewall to test if outbound UDP is allowed.