HttpClient in Universal Windows app running on Windows 10 IOT Core throws Exception from HRESULT: 0x80072EFD

I´m using VS2015 to deploy a universal app to a Raspberry Pi 2 Model B running Windows 10 IOT Core (10.0.10240). Any usage of the HttpClient to call a WebService or retrieve some data like the following

HttpClient client = new HttpClient();
var re = await client.GetAsync("http://somehost/api/values/5");

yields an Exception from HRESULT: 0x80072EFD.

Capabilities

• Internet (Client)
• Internet (Client & Server)
• Private Networks (Client & Server)

are set in the app manifest. Any suggestions?

Experienced the 0x80072efd problem. Appeared to be something with proxy settings gone wrong. The following worked for me (from admin command prompt):

netsh winhttp reset proxy