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This article is about Kaspersky Endpoint Security for Windows (KES for Windows)

Problem

HIPS (Host Intrusion Prevention System) unexpectedly blocks data stream (audio, video) in trusted communication software such as MS Teams, Skype, Skype for Business etc.

Solution

The root cause is in KUsrInit.exe (parent process for many processes in the OS where it exists) which in some cases can be found on pre-installed OS on Dell computers. 

KUsrInit.exe process must be added to HIPS trusted as well to avoid such issue.