[Users] Cannot connect via spice-html5. & How to use noVnc?

Here's my ovirt-websocket-proxy's status when I open the spice-html5 client ovirt-websocket-proxy.service - oVirt Engine websockets proxy Loaded: loaded (/usr/lib/systemd/system/ovirt-websocket-proxy.service; enabled) Active: active (running) since Fri 2013-07-12 17:03:46 CST; 31s ago Main PID: 19226 (ovirt-websocket) CGroup: name=systemd:/system/ovirt-websocket-proxy.service └─19226 /usr/bin/python /usr/share/ovirt-engine/services/ovirt-websocket-proxy.py start Jul 12 17:03:46 engine systemd[1]: Started oVirt Engine websockets proxy. Jul 12 17:04:01 engine ovirt-websocket-proxy.py[19226]: WebSocket server settings: Jul 12 17:04:01 engine ovirt-websocket-proxy.py[19226]: - Listen on *:6100 Jul 12 17:04:01 engine ovirt-websocket-proxy.py[19226]: - Flash security policy server Jul 12 17:04:01 engine ovirt-websocket-proxy.py[19226]: - SSL/TLS support Jul 12 17:04:01 engine ovirt-websocket-proxy.py[19226]: - Deny non-SSL/TLS connections Jul 12 17:04:01 engine ovirt-websocket-proxy.py[19226]: - proxying from *:6100 to targets in /dummy Jul 12 17:04:01 engine ovirt-websocket-proxy.py[19226]: 1: handler exception: WSRequestHandler instance has no attribute 'last_code'