Error Mounting CIFS / NFS Share

Hello,

I have been trying for days to mount a CIFS / NFS share in my Home Assistant. The share is shared by my Synology and is accessible via my Windows PC without any problems.

This is the error message:

Logger: homeassistant.components.hassio
Source: components/hassio/websocket_api.py:135
integration: Home Assistant Supervisor (documentation, issues)
First occurred: 11:35:24 (2 occurrences)
Last logged: 11:36:24

Failed to to call /mounts - Could not unmount Medien due to: Transaction for mnt-data-supervisor-mounts-Medien.mount/stop is destructive (mnt-data-supervisor-mounts-Medien.mount has 'start' job queued, but 'stop' is included in transaction).
Failed to to call /mounts - Reloading Medien did not succeed. Check host logs for errors from mount or systemd unit mnt-data-supervisor-mounts-Medien.mount for details.
2024-09-23 09:34:54.759 homeassistant systemd[1]: Mounting Supervisor nfs mount: Medien...
2024-09-23 09:35:24.814 homeassistant systemd[1]: Requested transaction contradicts existing jobs: Transaction for mnt-data-supervisor-mounts-Medien.mount/stop is destructive (mnt-data-supervisor-mounts-Medien.mount has 'start' job queued, but 'stop' is included in transaction).
2024-09-23 09:36:24.941 homeassistant systemd[1]: mnt-data-supervisor-mounts-Medien.mount: Mounting timed out. Terminating.
2024-09-23 09:36:24.943 homeassistant systemd[1]: mnt-data-supervisor-mounts-Medien.mount: Mount process exited, code=killed, status=15/TERM
2024-09-23 09:36:24.943 homeassistant systemd[1]: mnt-data-supervisor-mounts-Medien.mount: Failed with result 'timeout'.
2024-09-23 09:36:24.943 homeassistant systemd[1]: mnt-data-supervisor-mounts-Medien.mount: Unit process 13025 (mount.nfs) remains running after unit stopped.
2024-09-23 09:36:24.943 homeassistant systemd[1]: Failed to mount Supervisor nfs mount: Medien.
2024-09-23 09:42:16.239 homeassistant kernel: audit: type=1334 audit(1727084536.238:554): prog-id=147 op=LOAD
2024-09-23 09:42:16.240 homeassistant systemd-timesyncd[457]: Network configuration changed, trying to establish connection.
2024-09-23 09:42:16.252 homeassistant systemd[1]: Started Journal Gateway Service.

I have tried it via NFS as well as via CIFS. I used Home Assistant OS as a VM under Proxmox. I turned off the Synology firewall as a test, but that didn’t change anything. I do not see any entries in the log of my firewall (UDM Pro). I’m getting out of ideas.