404. That’s an error.
The requested URL /add?source=atgs&feedurl=http%3A%2F%2Fwww4.ac-nancy-metz.fr%2Feps%2Fsite%2Fnews%2Ftransversal%2Fsyndication.xml was not found on this server. That’s all we know.
/add?source=atgs&feedurl=http%3A%2F%2Fwww4.ac-nancy-metz.fr%2Feps%2Fsite%2Fnews%2Ftransversal%2Fsyndication.xml