Problems with Domain-Users for Network-Share (for Backups)

Hi,

I am struggling in configuring a network share.

I am using HAOS and I want my backups to be generated on my NAS.
So I went to Settings → Sysdtem → Storage and was dding a new network share to be used for backups.

It always fails with the following errors:

2024-05-23 16:58:44.333 haos systemd[1]: Mounting Supervisor cifs mount: qn...
2024-05-23 16:58:44.339 haos kernel: CIFS: Attempting to mount //qnap.domain.de/haos-backup
2024-05-23 16:58:44.405 haos kernel: CIFS: Status code returned 0xc000006d STATUS_LOGON_FAILURE
2024-05-23 16:58:44.405 haos kernel: CIFS: VFS: \\qnap.domain.de Send error in SessSetup = -13
2024-05-23 16:58:44.409 haos kernel: CIFS: VFS: cifs_mount failed w/return code = -13
2024-05-23 16:58:44.409 haos mount[133857]: mount error(13): Permission denied
2024-05-23 16:58:44.409 haos mount[133857]: Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) and kernel log messages (dmesg)
2024-05-23 16:58:44.413 haos systemd[1]: mnt-data-supervisor-mounts-qn.mount: Mount process exited, code=exited, status=32/n/a
2024-05-23 16:58:44.413 haos systemd[1]: mnt-data-supervisor-mounts-qn.mount: Failed with result 'exit-code'.
2024-05-23 16:58:44.413 haos systemd[1]: Failed to mount Supervisor cifs mount: qn.

So I expected to have a access right problem. I tried to mount the share from my Linux box in same network (not joined into the Samba-Domain) with an entry in /etc/fstab and it got same error as long as I did not put the domain=<domain> parameter in. So a successful mount was possible with the following entry:

\\qnap\haos-backup /mnt cifs domain=<domain>,credentials=/root/secret3.txt,_netdev 0 0

Removing the "domain= results in error messages.

So my question is how can I tell my HAOS to use the domain part when trying to connect?

Thanks a lot!

/KNEBB