id summary reporter owner description type status component version resolution keywords cc guest host 9163 VirtualBox 4.0.10 doesn't detect my network card anymore mediaf "Since I upgraded to the last Vbox release, I can't start any guest ( I have a debian 5.08 and a Windows Seven ) I get an error message : Failed to open a session for the virtual machine Nonexistent host networking interface Unknown error creating VM I have VBox Installed on a notebook with Windows XP Sp3. I have an ethernet card ( Intel(R) 82577LC Gigabit Network Connection ) a wireless card (Realtek RTL8191SE Wireless LAN 802.11n PCI-E NIC ) and the virtual VirtualBox Host-Only Ethernet Adapter. When using the host Windows XP, I don't have any problem with the two network cards, but Vbox seems to not detect my ethernet card : in the dropdown menu used to choose the network card when configuring a guest, only my wireless card appears, so if the Wifi isn't activated the guests with bridged mode network refuse to start throwing ""Nonexistent host networking interface"" " defect closed network VirtualBox 4.0.10 duplicate Linux Windows