Affected version(s): all
The open-xchange service is not starting successfully. You can't login to the service and commands like listuser are not working.
You can check this with service open-xchange status or by looking at the logfiles under /var/log/open-xchange/
In some recent support requests we found that the permissions in the osgi directory where wrong. If this is the case you see something like this in the open-xchange-osgi.log:
The open-xchange program should not be used to start the service as root user. Use the commands below instead. If you start open-xchange via this command it changes the permissions of some files/directories. Since 7.6.2 there is a check build in which will produce an error message and quit if you don't start it as the open-xchange user. Another cause could be wrong permissions from a backup or from copying files.
You have to change the permisions/ownership:
and restart the open-xchange service: