VNC console blank with buttons greyed out

JustaGuy

Renowned Member
Jan 1, 2010
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I'm not sure if this was something I did or if it's a bug.

A reboot resolved it.

I just finished restoring a snapshot & afterward any VNC console I opened showed only a solid white screen with 3 or 4 of the top-bar buttons greyed out. Options was one that appeared to remain pressable, although I didn't try.
I was in a panic & didn't think to get a screenshot. Or to switch browsers or VNC viewers. I still haven't taken the time to figure out how to use something like TightVNC.

I've recently upgraded to pve 1.5/4627 from 1.4/4390 and use kernel 2.6.24.9-pve.

The restored .tar was 79GB & it took approximately 100 minutes to recreate a 100GB VM. All VMs were stopped during in hopes of speeding things up.

During the process I watched the home screen of the web interface, syslog & top. While dd was churning away, in an attempt to consolidate screens, I installed htop about halfway through.
I started 1 tiny VM a few times & looked at it's console, so I know it worked at least for awhile during the first half. Also were 2 30-second network outages while I tinkered with the router.

A quick diversion to an unrelated item- aptitude wanted to remove the kernel saying it's not required by anything. It doesn't seem right so I figure I'll mention it.

The console(s) were working prior to installing htop- I didn't try after it was installed to know if that's what did it.

After rebooting the host machine the console was back to normal.

Apparently the VMs that didn't display were indeed running, as evidenced by the guest wanting to boot into safe mode when I could see.
Assuming as a result of the host's shutting down to reboot while the guest was starting up & not because of the restore operation.
 
I have the same problem.... :/

But before restart Im trying to find problem/fix it somehow. already tried restart all pve* & qemu services.. - nothing.
"lucky me" - I'm just preparing next server to migrate services, so i don't care about downtime.. ;)

Java applets looks like you said. I also try connect directly via vnc client and qm vncproxy commant..
Looks ugly. Keyboard works fine, after opening client vnc i was able to login, type password and start sshd. i didn't see anything - but ssh was started, so it works for sure.
Im attaching two screenshot - one is fresh machine with debian install, second one is gentoo where i logged to start ssh.

On Gentoo Im compiling 170 packages, so if you have any idea what else can i check with vnc/vga - let me know, propably Im still before restart host.;-)
 

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Well, I can say at least that mine didn't quite look like that. At the time it was a solid color totally void of content than the buttons along the top.

I have seen something similar while using PVE 1.4 where the first quarter of the embedded VNC console was all that was drawn. I didn't have the garbled artifacts, though.

In that case it would only happen if I stopped a machine all the way, left the browser pop-up open, & tried to re-use it to log in again after the machine was back up.

Simply closing & re-opening the console would solve that.

Since then I don't re-use those browser-based consoles, so I don't know if it happens in PVE1.5.

Are those screenshots of the embedded browser VNC or a standalone client?

I didn't try a client other than the one that launches from Firefox, so I don't know what it would've looked like from that- perhaps mine would've appeared the same had I done so, just don't know.

I wish I had a solution to offer other than to reboot.
I could suggest to maybe restart whatever service provides the VNC image, however I wouldn't be speaking from experience & it would be a less-than-educated guess.

I wish you the best.
 
Are those screenshots of the embedded browser VNC or a standalone client?

I didn't try a client other than the one that launches from Firefox, so I don't know what it would've looked like from that- perhaps mine would've appeared the same had I done so, just don't know.

These screenshots are from standalone vnc client. In java applet (in browser) i had look which you said - only buttons and blank screen.
I will try to check some other ideas..
 
These screenshots are from standalone vnc client. In java applet (in browser) i had look which you said - only buttons and blank screen.
I will try to check some other ideas..

pls post the output of 'pveversion -v'
 
pls post the output of 'pveversion -v'
Oh, sorry..

m:~# pveversion -v
pve-manager: 1.5-5 (pve-manager/1.5/4627)
running kernel: 2.6.32-1-pve
proxmox-ve-2.6.18: 1.5-4
pve-kernel-2.6.32-1-pve: 2.6.32-4
pve-kernel-2.6.18-1-pve: 2.6.18-4
qemu-server: 1.1-11
pve-firmware: 1.0-3
libpve-storage-perl: 1.0-8
vncterm: 0.9-2
vzctl: 3.0.23-1pve8
vzdump: 1.2-5
vzprocps: 2.0.11-1dso2
vzquota: 3.0.11-1
pve-qemu-kvm-2.6.18: 0.9.1-5
m:~# uname -a
Linux m.(...).pl 2.6.32-1-pve #1 SMP Fri Jan 15 11:37:39 CET 2010 x86_64 GNU/Linux
m:~#

If you need something else let me know, i will restart host system after about 20 hours from now, so I have time to test something more..
 
Oh, sorry..

m:~# pveversion -v
pve-manager: 1.5-5 (pve-manager/1.5/4627)
running kernel: 2.6.32-1-pve
proxmox-ve-2.6.18: 1.5-4
pve-kernel-2.6.32-1-pve: 2.6.32-4
pve-kernel-2.6.18-1-pve: 2.6.18-4
qemu-server: 1.1-11
pve-firmware: 1.0-3
libpve-storage-perl: 1.0-8
vncterm: 0.9-2
vzctl: 3.0.23-1pve8
vzdump: 1.2-5
vzprocps: 2.0.11-1dso2
vzquota: 3.0.11-1
pve-qemu-kvm-2.6.18: 0.9.1-5
m:~# uname -a
Linux m.(...).pl 2.6.32-1-pve #1 SMP Fri Jan 15 11:37:39 CET 2010 x86_64 GNU/Linux
m:~#

If you need something else let me know, i will restart host system after about 20 hours from now, so I have time to test something more..

the problem is the you have the wrong pve-qemu-kvm installed (the version for 2.6.18).

you run kernel 2.6.32 with KVM from 2.6.18 - this does not work.

howto fix:
we have 3 virtual packages - see http://pve.proxmox.com/wiki/Proxmox_VE_Kernel. currently you have proxmox-ve-2.6.18 installed.

if you want to run 2.6.32, you need to install the following virtual package:
Code:
apt-get install proxmox-ve-2.6.32
this will install the right KVM module for 2.6.32 (and the packages for KSM).
 
the problem is the you have the wrong pve-qemu-kvm installed (the version for 2.6.18).

Damn.. Right. I was trying to install 2.6.18 but i have some problems with network, then try 2.6.32.. and forget about update proxmox packages. My fail..

Thanks - now vnc works like a charm :)
 
Hi

I've got the same problem with Real VNC free edition 4.1.2 on Win XP, when my client tries to connect me by: Right clicking the VNC server icon at the bottom right of my screen, where he is supposed to click on add new client so i can take over. All the buttons are grayed out except for the close VNC server button.

Please assist with this issue here

Thanking you in advance