You cannot connect to any website or online service with a Windows 8 metro app. Opening the desktop version of IE connects properly.
The metro IE or other metro apps fail to connect to the internet unless you uncheck the "use a proxy server for your LAN" checkbox via Desktop version IE.
Note: Windows updates may also fail as well.
First seen in
Sophos Web Appliance WS500
The failure is due to proxy settings.
What To Do
See the following Microsoft resources for further information and solutions.