[virt-tools-list] No VNC / virt-viewer output from guest VM

[Cole Robinson]

On 04/20/2010 03:28 AM, Dominik Schips wrote:
> Hello,
> 
> I did a standard Debian 5.0.4 (Lenny) install. After this I get the
> qemu-kvm (0.12.3+dfsg-4~bpo50+2) and virt-manager (0.8.3-2~bpo50+1) from
> backports.org for my KVM setup.
> 
> On one host (16GB RAM, 2x quadcore) I didn't get any output from
> virt-viewer (0.0.3). So it is unpossible to install any guest VM.
> 
> netstat tell me that localhost:5900 is available and a telnet test get a
> connection.
> 
> On another host with the same setup I have no problems to get VNC
> output.
> 
> I tried a lot (tcpdump, strace, --debug from virt-manager, konsole
> install with virt-install) and didn't find any usefull information what
> cause the problem.
> 
> For the connection I use a Windows 7 host with cygwin with x forwarding.
> I thought that could cause the problem but if I connect with a linux
> system there is also no VNC output.
> 
> Any advice how to debug virt-viewer, virt-manager to get informations
> about the VNC connections?
> 

You can try virt-viewer with --debug and/or --gtk-vnc-debug options.
Also, make sure that 'vncviewer localhost:5900' works when run from the
local machine: if that fails, it might be a qemu or kvm issue.

- Cole