Virt Manager not showing screen in SPICE

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:~$