[OSM-dev] 401 after PUT /api/0.6/[node|way|relation]/#id?

[Karl Guggisberg]

Hi

A JOSM user reported a 401 status message after a PUT
/api/0.6/[node|way|relation]/#id,
see
  https://josm.openstreetmap.de/ticket/3887#comment:7

(see his JOSM logs).

Under what conditions is the OSM server replying a 401 after an object
update?

Regards
Karl