*** Bug 1273566 has been marked as a duplicate of this bug. ***
I can confirm that it works for me with next setup: Client Windows7 32b Coolkey distro: https://www.nabber.org/download/view.php?file=coolkey-2010-10-30.zip.meta4 VirtViewer v2.0-96 from rpm -qf /usr/share/spice/virt-viewer-x86.msi rhevm-spice-client-x86-msi-3.6-4.el6.noarch Guest is RHEL 6.7.z x86_64 or RHEL7.2 But. VirtViewer gets stuck 100% (Not Responding) with RHEL6.7.z The only way to exit from it - close it forcibly. Without attached SmartCard I works well.