I was struggling a bit with connecting to SQL Server Mobile Report Publisher in SSRS 2016 RC2. When I wanted to load data from Data Sets that are created in SSRS, I had to connect to SSRS first. I was presented with a very laconic UI, and I had to struggle with a couple of errors, without seeing any details of what was wrong.
Now, I eventually figured out that Server Address, apparently expects the URL of this type:
http://localhost/reports
and Username and Password are your Domain accounts and "Use secure connection" must be unchecked!
Only then it started working, and I was able to see my DataSets and Data Sources.
