Virt Manager not showing screen in SPICE

[The Darkness]

I have an UBUNTU server (20.04) with libvirtd installed.
I used to connect to that server using Virt Manager from an UBUNTU desktop (18.04).

Starting today (2021-11-08) the Virt Manager does not shows the screen of the virtual machines.

I added the VNC server to one VM and it worked fine, but the SPICE server is not working.

Server:
suporte@hsm-vserver-01:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.3 LTS
Release: 20.04
Codename: focal
suporte@hsm-vserver-01:~$ apt-cache policy libvirt-daemon
libvirt-daemon:
  Installed: 6.0.0-0ubuntu8.14
  Candidate: 6.0.0-0ubuntu8.14
  Version table:
 *** 6.0.0-0ubuntu8.14 500
        500 http://br.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     6.0.0-0ubuntu8.3 500
        500 http://br.archive.ubuntu.com/ubuntu focal-security/main amd64 Packages
     6.0.0-0ubuntu8 500
        500 http://br.archive.ubuntu.com/ubuntu focal/main amd64 Packages
suporte@hsm-vserver-01:~$

Desktop:
jlbastos@jlbastos-desktop:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.6 LTS
Release: 18.04
Codename: bionic
jlbastos@jlbastos-desktop:~$ apt-cache policy virt-manager
virt-manager:
  Instalado: 1:1.5.1-0ubuntu1.2
  Candidato: 1:1.5.1-0ubuntu1.2
  Tabela de versão:
 *** 1:1.5.1-0ubuntu1.2 500
        500 http://br.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 Packages
        500 http://br.archive.ubuntu.com/ubuntu bionic-updates/universe i386 Packages
        100 /var/lib/dpkg/status
     1:1.5.1-0ubuntu1 500
        500 http://br.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        500 http://br.archive.ubuntu.com/ubuntu bionic/universe i386 Packages
jlbastos@jlbastos-desktop:~$

[The Darkness (jlbastos)]

The Virtual Manager start working again with SPICE
Has someone any idea what could have caused this problem?

[Christian Ehrhardt  (paelzer)]

Hi,
there was no recent update in 18.04 or 20.04 that would seem related.
So I do not have a great suggestion. For the sake of getting some information in case it happens again - was it starting the guest without Spice, or did it have the Spice device but you were only unable to connect to it?

[The Darkness (jlbastos)]

I was unable to connect to the SPICE.
But the SPICE is configured normally.
I can connect with VNC after adding it to the VMs.
The day after SPICE was working again. And i cant figure out what happens in the meantime.
No related update happens those days.

[Christian Ehrhardt  (paelzer)]

Thanks - that info might be handy if it comes up again or with other reporters.
For now I'll leave it with that, slightly puzzled but hoping it isn't a real global issue.