openindiana box: wants a password at rsync

[ThomasWaldmann]

    openindiana: Provider: virtualbox
    openindiana: Architecture: "amd64"
==> openindiana: Updating 'openindiana/hipster' with provider 'virtualbox' from version
==> openindiana: '202403' to '202409'...
==> openindiana: Loading metadata for box 'https://vagrantcloud.com/api/v2/vagrant/openindiana/hipster'
==> openindiana: Adding box 'openindiana/hipster' (v202409) for provider: virtualbox (amd64)
    openindiana: Downloading: https://vagrantcloud.com/openindiana/boxes/hipster/versions/202409/providers/virtualbox/amd64/vagrant.box
==> openindiana: Successfully added box 'openindiana/hipster' (v202409) for 'virtualbox (amd64)'!
tw@server:~/w/borg-clean$ vagrant destroy openindiana
    openindiana: Are you sure you want to destroy the 'openindiana' VM? [y/N] y
==> openindiana: Forcing shutdown of VM...
==> openindiana: Destroying VM and associated drives...
tw@server:~/w/borg-clean$ vagrant up openindiana
Bringing machine 'openindiana' up with 'virtualbox' provider...
==> openindiana: Importing base box 'openindiana/hipster'...
==> openindiana: Matching MAC address for NAT networking...
==> openindiana: Checking if box 'openindiana/hipster' version '202409' is up to date...
==> openindiana: Setting the name of the VM: borg-clean_openindiana_1725899252416_21926
==> openindiana: Fixed port collision for 22 => 2222. Now on port 2204.
==> openindiana: Clearing any previously set network interfaces...
==> openindiana: Preparing network interfaces based on configuration...
    openindiana: Adapter 1: nat
==> openindiana: Forwarding ports...
    openindiana: 22 (guest) => 2204 (host) (adapter 1)
==> openindiana: Running 'pre-boot' VM customizations...
==> openindiana: Booting VM...
==> openindiana: Waiting for machine to boot. This may take a few minutes...
    openindiana: SSH address: 127.0.0.1:2204
    openindiana: SSH username: vagrant
    openindiana: SSH auth method: private key
    openindiana: Warning: Remote connection disconnect. Retrying...
    openindiana: 
    openindiana: Vagrant insecure key detected. Vagrant will automatically replace
    openindiana: this with a newly generated keypair for better security.
    openindiana: 
    openindiana: Inserting generated public key within guest...
    openindiana: Removing insecure key from the guest if it's present...
==> openindiana: Machine booted and ready!
==> openindiana: Checking for guest additions in VM...
==> openindiana: Rsyncing folder: /mnt/fastssd/tw/w/borg-clean/ => /vagrant/borg/borg
([email protected]) Password: 

It must not ask for a pw there, it already has a working ssh key (see lines above).