Ingored files stay "out of sync"

I am strugging with the REST API:

curl -X POST -H “X-API-Key: KEYISHERE” ‘http://127.0.0.1:8385/rest/db/file?folder=FOLDER_ID&file=2%20WORK

Returns

404 page not found

Please note the syncthing server is running on port 8385 since I have two instances running under different users. API-KEY and folder (ID) have been masked.