Ok, 3 things
1. Try to connect without gproxy (in Warcraft tab, clear checkbox for gproxy gateway)
..if you can't connect even with no gproxy..
2. Try disabling your firewall/av
if that still does no help the problem is probably on ISP network blocking you from reaching our server. It wouldn't be the first time.
You can also reach me on discord so I can check a few additional things.