Experimenting a bit with the March 2018 PBIRS release in my home environment, and I have a new instance installed on a seperate server, we'll just call it DBSERVER01. I'm able to browse to the main page at http://dbserver01/reports and the web server page at http://dbserver01/reportserver.
When I try to open a new PBI report in PBI Desktop however, then Save As to the report server, I enter http://dbserver01/reports and only get the following:
I've tried to find additional logging but I've had no success. I suspect an authentication issue, but this message should specify that if that's the case. I'm just in a simple workgroup, no domain, but I have a similarly named account on both systems. If this is authentication, we need this dialoge to prompt for authentication, or give better feedback about what it's not reachable.
This is definitely looking like an authentication problem. I tried going to the web portal direct again from a different browser with no cached credentials, and sure enough it prompted for a username and password before I could connect. My guess is that PBI Desktop is passing invalid or unknown creds to PBI Report Server. We need the ability to specify a credential set to PBI Report Server I'm thinking...otherwise I think I'm stuck here.