thank you for your answer.
My network config is working.
I added the first, but the error is the same.
Erreur de téléchargement (curl) pour 'http://download.opensuse.org/distrib...11.3/repo/oss/repo/repoindex.xml':
Code erreur: Connection failed
Message erreur: Could not resolve host: download.opensuse.org (Domain name not found)
It does not find the repoindex.xml. I checked, this file does not exist.