Did you ever get this fixed?
We currently are experiencing the same issue - Google BigQuery connections with embedded creds working fine, no OAuth configured, and then it stops working. We are unable to republish using Desktop as we get the same error you mention. Last time this happened we couldn't fix it and then it started working by itself. We're on 9.2.7.
Any help or advice gratefully received.
Hi, it turned out to be a red herring. It had only ever worked because the internal proxy server at the company where I work was disabled temporarily. When they re-enabled it then it stopped working. We had to just add a rule to allow connections without authentication to the proxy server.