For those getting a username/password window. Goto Openbox AS4K android settings/SAMBA. User:administrator. Create a password. Or, you can disable/reset the SAMBA setting.
Those still not connecting, turn on and allow "Media Streaming" on your computer. This function is in the Network Settings of your computer. Network and Sharing Center/Media Streaming Options. Hope this helps. It helped me. Thank you very much people.
