Resolution
Incorrect installation of updates may lead to Virtuozzo management service or KSAL not able to start after reboot.The correct updating sequence is this:
1. Install Virtuozzo update;
2. Reboot HW node;
3. Install approved Windows updates;
4. Reboot HW node.
Installing Virtuozzo and Windows updates without reboot (step 2) will cause serious issues - e.g. non-starting Virtuozzo management service - in this case the reinstallation of Virtuozzo updates may help.
Note: All Windows updates can be installed on the HW node only, and never inside CTs.