A Virtuozzo Containers 6.0 node has been installed from scratch and updated up to VZU600022 during the installation. As a result, network is not working in any containers.
Parallels Network Filter is missing in the network adapter properties on the hardware node. This the screenshot of how it should be in the working state:
Faulty procedure of 'Parallels Network Filter' driver installation in VZU600022. The issue has been recognized as PCWIN-22408.
Add Parallels Network Filter manually:
Network Adapter Properties > Install... > Service Add... > Parallels Network Filter > Have Disk...
and point it to:
C:\Program Files (x86)\Parallels\PVC updates\Parallels Containers for Windows 6.0 update VZU600022\Install\INSTALLSCRIPTS\vznetflt.inf
Once the network filter is enabled, restart the affected containers to restore network connectivity.