Hello, everybody here I have a question about graphical buffers for rhel7. Thanks so much in advance who can give me some suggestions about that. When I try to do regression for bug859317(https://bugzilla.redhat.com/show_bug.cgi?id=859317) on RHEL7， I found that guest could be connected success with virt-viewer when set/update the graphics passwd to empty. But according to comment 2 in this bug, libvirt will blocks all access to the VNC server when set a password to empty. So could you please help us check is it acceptable on RHEL7? Below is my test steps on RHEL7: Version-Release number of selected component (if applicable): libvirt-1.2.8-3.el7.x86_64 qemu-kvm-rhev-2.1.0-5.el7.x86_64 kernel-3.10.0-150.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1. Define guest with a graphics device like: ......................................... <graphics type='vnc' port='-1' autoport='yes' passwd=""/> ......................................... 2. Connecting with vncviewer or virt-viewer . # virsh start dom2 # virsh dumpxml dom2 --security-info |grep graphics <graphics type='vnc' port='5900' autoport='yes' listen='127.0.0.1' passwd=''> </graphics> # virt-viewer dom2 connect the guest success with empty password 3. The problem can be reproduced when changed the graphics passwd from an non-empty to an empty # virsh dumpxml dom2 --security-info |grep graphics <graphics type='vnc' port='5900' autoport='yes' listen='127.0.0.1' passwd='123'> </graphics> # cat change-passwd.xml <graphics type='vnc' port='-1' autoport='yes' listen='127.0.0.1' passwd=''/> # virsh update-device dom2 change-passwd.xml # virsh dumpxml dom2 --security-info |grep graphics <graphics type='vnc' port='5900' autoport='yes' listen='127.0.0.1' passwd=''> </graphics> login the guest with virt-viewer command # virt-viewer testks also can connect the guest dom2 success with empty password 4. I produce the same steps on RHEL6.6 libvirt-0.10.2-46.el6.x86_64, the guest can not be connected when set graphics vnc password to empty, the same result with bug 859317. Actual results: we can login the guest when set the graphics passwd empty Expected results: I am not sure what is the right behaviour for RHEL7? thank