![Finally got serial ports working, win7 host, if you have "Failed to attach the USB device (E_INVALIDARG)" issues then try deleting this win7 registry key, fixed mine. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{36FC9E60-C465-11CF-8056 ... Finally got serial ports working, win7 host, if you have "Failed to attach the USB device (E_INVALIDARG)" issues then try deleting this win7 registry key, fixed mine. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{36FC9E60-C465-11CF-8056 ...](https://external-preview.redd.it/R6D416r_3MRxLJzYQpNrBMsWKtbYzrIraHlNKY-o6TE.jpg?auto=webp&s=a50e29c515203c728f1f2fe89c51b0cf8e8f3403)
Finally got serial ports working, win7 host, if you have "Failed to attach the USB device (E_INVALIDARG)" issues then try deleting this win7 registry key, fixed mine. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{36FC9E60-C465-11CF-8056 ...
![Fix "Unable to connect USB device to virtual machine now. Try to connect this USB device later." Fix "Unable to connect USB device to virtual machine now. Try to connect this USB device later."](http://kb.parallels.com/Attachments/kcs-17744/Screen%20Shot%202020-03-24%20at%202.15.59%20PM.png)
Fix "Unable to connect USB device to virtual machine now. Try to connect this USB device later."
![Connect an USB key to a VirtualBox 6.0 / 5.2 virtual machine - Virtualization - Tutorials - InformatiWeb Connect an USB key to a VirtualBox 6.0 / 5.2 virtual machine - Virtualization - Tutorials - InformatiWeb](https://us.informatiweb.net/images/tutoriels/logos/us/virtualbox-connect-an-usb-key-to-a-vm.jpg)
Connect an USB key to a VirtualBox 6.0 / 5.2 virtual machine - Virtualization - Tutorials - InformatiWeb
![How to solve VirtualBox exception when attaching a USB device: failed to create a proxy device for the usb device. (error verr_pdm_no_usb_ports) | Our Code World How to solve VirtualBox exception when attaching a USB device: failed to create a proxy device for the usb device. (error verr_pdm_no_usb_ports) | Our Code World](https://cdn.ourcodeworld.com/public-media/gallery/gallery-5f235118d9758.png)
How to solve VirtualBox exception when attaching a USB device: failed to create a proxy device for the usb device. (error verr_pdm_no_usb_ports) | Our Code World
![Failed to attach the USB device SEGGER J-Link [0100] to the virtual machine WINDOWS 7 - Stack Overflow Failed to attach the USB device SEGGER J-Link [0100] to the virtual machine WINDOWS 7 - Stack Overflow](https://i.stack.imgur.com/2l61S.png)