Hi, Following up from my original thread here: (closed, can’t reply) I found the root cause on my setup: NAS: UGREEN DXP4800 Plus OS: UGOS Syncthing running in Docker Symptom: normal scan/sync worked, but filesystem watcher failed with: error while traversing /some/folder: permission denied At first someone suspected inotify limits, but that was not the issue. The limits were already high, and the affected folder did not contain many directories. The useful test was running inotifywait ...