I have the follwoing problem: I use different virtual machines on Virtualbox I access it from Windows and Ubuntu using remotedesktop or rdesktop. Using Windows 7/8.1 works perfectl to access the VMs. I use no authentification on Virtualbox side. After I upgraded Windows 7/8.1 on my notebooks to Windows 10 (OS on notebook not the VM) it is not possible to access Virtualbox VMs using remotedesktop anymore. From Ubuntu still no problem. If I rollback to Windows 7 no problem. It does not have any effect if I switch off the firewall. So is there a new Group policy or other configuration that restricts the access? How to make it work. Again I do not access the VM directly by rdp but Virtualbox through VRDP offered with Authentification Method=None.