I'm new to using Web AppBuilder (beta 2). After I double click the startup.bat file Internet Explorer (9) opens but I get an 'Internet Explorer cannot display the page' warning. I've opened Port 3344 for server.js but still don't get anything. On our work domain the firewall is managed by group policy so not sure if this is the problem or if it's a different file I need to give permissions to. Can anyone help?