Trace logs may show the response (not sure offhand), if not perhaps Qbit’s logs have more information, since we need to understand why it’s failing with a 400 response (generally means it didn’t like something in the request).
Thanks for the suggestion! I enabled trace logging and ran through the process, but I didn’t get any additional information from Sonarr. Would that Error 400 be the response from the QB API?
qBittorrent doesn’t seem to generate logs at that level. I don’t see anything generating when I attempt the connection.
A 400 response tells the caller that the request was rejected because something was wrong with the request and usually what was wrong. What do your QBit settings in Sonarr look like?
Qbit has had a history of making breaking changes and while we do our best to remain backwards compatible it’s likely something Sonarr is sending is not supported by 3.3.0 and instead of ignoring it, it rejects the request.