UCS 42.2.2 + Kopano Webapp Files LS Forbidden

got a new installation UCS 4.2.2 + Kopano Webapp
File acces to an existing samba-server is denied.
apache2/error.log shows:
… [BACKEND_SMB]: SMB Share openened successfully!, referer:
… [BACKEND_SMB]: [LS] start for dir: /, referer:
… [BACKEND_SMB]: LS Forbidden: Icewind\SMB\Exception\ForbiddenException Object
… [ERROR][AccountStore] Account check failed: Unauthorized. Wrong username or password
Access via smbclient, however, works
Ownership for/var/lib/kopano-webapp/plugin_files already changed
This should be a showcase für Kopano + File Access
Thank you for any hint …

After serveral hours of investigation I found out that smbclient requires “security = user” at the target server. On my samba server I had “security=share” and some public shares, to which smbclient can access without user login.
Appearently the file plugin uses the same interface - now it works.