Hello and
sorry for the delay in getting back to you both, been a bit busy 
I reside in the UK and use BT Infinity (high-speed broadband from BT Internet).
Having done a few tests, I am able to connect via my ISP via a Laptop running Windows 8.1 over Wifi and via an Ethernet connection to my ISP using a PC running Windows 10 preview.
The problem occurs when using the same PC (as the Win 10 preview) if booting from the hard disk that is running Windows 7 (which is my main set-up) and I have only experienced the problem after applying the latest update 4.7 installer, I used to have UE4 running fine using previous builds and nothing else has changed on my PC.
Hope that helps…
best wishes…