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With version 7.1.0 VirtualBox changed the default behavior of RDP encryption if a user hasn't created own certificates.
See the VirtualBox changelog:
Old default:
VirtualBox used hard wired internal certificates or even no encryption.
Since the self-signed certificates are not known by the host the first RDP connection to a VM starts with a warning like this (provided by a volunteer from LHC@home):
The VirtualBox manual gives a hint how the old behavior can be enabled:
https://www.virtualbox.org/manual/topics/remotevm.html#vrde-crypt
Vboxwrapper should configure VMs using standard RDP instead of TLS to avoid the warning message being presented for each fresh VM.