This video shows how to get around the issue in Virtual Machine Manager where you are constantly prompted for a password when connecting (turning on or creating) a virtual machine on the remote server.
Long story short, use VNC as the display server rather than the default Spice server.
Check out the related post at CyberScribe.org
Watch video KVM: Virt-manager Remote Connection Fix online without registration, duration hours minute second in high quality. This video was added by user CyberScribe.org 09 February 2015, don't forget to share it with your friends and acquaintances, it has been viewed on our site 11,691 once and liked it 44 people.