I currently haven't set up the jenkins slave agent, so creating a new node and doing the launch test succeeds in starting the VM but fails to connect. At some point "[VirtualBox] Maximum number of attempts reached" happens but the VirtualBox seems to stay running (at least the windows process VirtualBox.exe is still there). I also just noticed that the log of the launch test shows "maximum number..." but still keeps the progress indicator spinning. Maybe for the plug-in the launch is still stuck?