To get started with Raspberry pi3 I try to get the https://developer.microsoft.com/de-de/windows/iot/samples/helloworld sample to work, but I can't deploy to my device. I get the following error:
DEP6957 : Failed to connect to device using Universal Authentication. Please verify the correct remote authentication mode is specified in the project debug settings. 0x8007274C: The network event being waited on triggered an error.

My PC has Windows 10 Version 1607 (Build1493.693)
The OS Version of my device is OS Version: 10.0.14393.693
I updated the SDK to Windows 10 SDK 10.0.14393
I am using Microsoft Visual Studio Professional 2015 Version 14.0.25431.01 Update 3

I can connect to my device with the Windows Device Portal
What is it I am doing wrong?