Hello Nico, I recently run into the same issue. Until I figured dput-ng uses paramiko underneath, which in turn reads the usual /etc/ssh/ssh_known_hosts and ~/.ssh/known_hosts files.
Once you add the host key to the list of known hosts, either system wide
or for the user trying to connect, dput-ng can well upload without the
quoted message.
To retrieve the ssh key use:
ssh-keyscan -t rsa -H ${HOST}
Hope this helps.
Kind Regards
Markus Wanner
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