Ronald Kraijesteijn tells a tale of woe with Power BI Report Server:
The setup is an on-prem Power BI Report Server, fully patched, running the May 2026 release (
1.26.9637.31070, build15.0.1121.109). I had a report I needed to publish, but first I had to swap a whole batch of connection strings. Doing that by hand in Desktop is miserable, so I took a shortcut that turned out to be the root of all my pain. More on that below.
The error was a generic mess and the cause was getting too high for your station and actually expecting something from Power BI Report Server.
I say this as a fellow long-time Power BI Report Server sufferer.