The credential tester always reported "Authentication failed — qBittorrent
rejected the credentials" for the qBittorrent service, even when credentials
were correct. test_connection classified any RuntimeError whose message
contained "login failed" as an auth failure — and the gateway-timeout error
(502/503/504 from the reverse proxy) and the wrong-URL diagnostic both started
with "qBittorrent login failed:", so a proxy timeout was reported as a
credentials rejection. That sent users down the wrong path (re-entering correct
passwords to fix a 504).
- QbittorrentClient._login: gateway and URL/routing errors no longer contain
"login failed"; only a genuine "Fails." body carries the
"invalid username or password" signal.
- integrations/qbittorrent.test_connection: key the auth message off
"invalid username or password" specifically; all other login errors flow
through translate_connection_error so the real reason (proxy timeout, wrong
URL, empty body) is surfaced.
After this, a failing test reports the actual cause (e.g. "qBittorrent is
unreachable: reverse proxy returned HTTP 504 ...") instead of accusing the
credentials. New regression test asserts a gateway error is NOT reported as
"Authentication failed". 386/386 backend tests pass; ruff clean.
Developer