We configured harvest with external authentication. Since update to 14.0.2, user authentication fails, when the password contains non ascii characters (e.g. Umlaut).
This problem had previously been addressed by an efix to version 13.0.3.
Release : CA Harvest SCM 14.0.2 and up
The efix previously provided with SCM v13.0.3 was included in V14.0.2.
Reinstalling SCM v14.0.2 resolved the problem.