Well, to get back on the way:
1.) After performing the update, I removed step by step every single rpm which I had downloaded from
http://smeserver.free.fr/Files/open-xchange/ox7/. Command: rpm -e alldownloadedrpm's --nodeps.
2.) I deleted manually all information of ldap, psql and open-xchange on the server.
3.) I re-installed all downloaded rpm's with yum localinstall.
4.) I fixed the rebuild_db.sh file.
5.) run initall_ox
6.) run scan_users.sh
7.) re-enter all passwords of every user in the server-manager.
There we go - open-xchange works.
Unfortunately all previous in ox stored information is gone. Again my question: does anybody work successfully with ox_backup and ox_restore? Here's the error message when starting the backup:
[root@warp sbin]# backup_ox
config file testing succeeded
pg_dump: [Archivierer (DB)] Verbindung zur Datenbank »openexchange« fehlgeschlagen: FATAL: IDENT authentication échouée pour l'utilisateur "openexchange"