Issue when updating Kaspersky Security for Virtualization Light Agent using Citrix App Layering and a full user layer

The article concerns Kaspersky Security for Virtualization 5.0 Light Agent.

Issue

When you upgrade Kaspersky Security for Virtualization Light Agent to version 5.1 that is used together with Citrix App Layering and a full user layer, you may still have folders, files and registry keys from the previous version of the application on your computer.

Cause

Citrix recommendations to install the antivirus application on the template with a full user layer have not been implemented. The full user layer logs all changes currently occurring on the virtual machine.

Solution

1. The template with the new version of the application must include the AlwaysOnBoot multi-line parameter in the HKLM\SYSTEM\CurrentControlSet\Services\unifltr\ key. Add the following folders as key parameters:
   • C:\ProgramData\KasperskyLab\
   • C:\ProgramData\Kaspersky Lab\
   • C:\Program Files(x86)\Kaspersky Lab\
   This key must be on the layer where the KLNagent Network Agent and Kaspersky Security for Virtualization Light Agent are installed. Using the AlwaysOnBoot key is a Citrix workaround. It is neither officially tested nor supported.
2. Restore the user layers. For instructions, see the Citrix documentation.

To learn more about installing antivirus applications, see this page of Citrix documentation.