I am having a strange issue.
We have two servers, one with Windows Server 2016 and the other with Windows Server 2019. Both servers are running the latest May 2020 Power BI Report Server.
When I make a simple API call:
http://127.0.0.1/Reports/api/v2.0/System/AllowedActions
On the Windows 2016 Server, it comes back in < 150 ms. Making the same call on the WIndows 2019 Server, it takes over 4+ seconds.
I wanted to rule out a first time run, or other issues, so I ran each command 10 times. It was consistent. < 150 ms for the 2016 Server and >4000ms for the 2019 Server.
I then ran some other tests, running the API call from various places to various endpoints:
| Ran From | API Endpoint | Time |
| Windows Server 2016 | Self | 148ms |
| Windows Server 2019 | Self | 4205ms |
| Windows Server 2016 | Windows Server 2019 | 142ms |
| Windows Server 2019 | Windows Server 2016 | 144ms |
| Laptop | Windows Server 2016 | 156ms |
| Laptop | Windows Server 2019 | 153ms |
As can be seen, calling the API from anywhere to anywhere gets fast response times, except for when I call the API from the Windows 2019 Server to itself.
I can't find any differences between the 2016 Server and the 2019 Server that might cause a difference. The only thing I know of off hand is that on 2016 we are running .Net Framework 4.7.2 and on 2019 it is running 4.8. But I doubt that would make the difference.
If anyone has any thoughts of ideas, i'm open. We have a simple web app that runs on the server to provide some details via the API. I know I coudl move it off to another server, but I'd rather keep it all together if possible.
