Same thing for some people on 1364. They see this screen in browser:

People tried different browsers, cleared cookies, cache, flash also didn't help with its reinstall and 1 mill other regular troubleshooting steps also did not help.

For me its all working nice and smooth but for some people it is not. Some are able to play from client but its laggy there for some reason and 3v3 always says that they cannot connect so another person needs to take lead always instead of them and only after that 3v3 works for them. Refreshing game does not help.

For the people I asked - none of the browsers work. Only client but laggy and their internet is fine.