we are using the freeware edition for quiet a while now(It worked pretty well so far).
Then I installed netwrix on a different server and now my Netwrix-E-Mail is getting at least 20 Event ID 10028 System Errors every 10 minutes. Since there is no option to exlucde specific Events from Real-time Alerts I tried to get rid of the Error in the omitErrorList.txt but it's not working.
Description of Error: DCOM was unable to communicate with the computer COMPUTER using any of the configured protocols; requested by PID 107c (C:\Program Files (x86)\Netwrix\Netwrix Event Log Manager\EventManager.exe).
The Error is created when the client machine is offline (as you said). Confusingly it wasn't like this on the other host before...
Unfortunately I can't filter the alerts out of my mailbox settings so I tried it with omitErrorsList:
# This file includes event log errors to be excluded from the Event Log Manager reports.
# Syntax: Error text
# Note: any part of the expression can be * (to exclude any number of any characters).
# Example: *Unable to cast object of type*
*DCOM was unable to communicate with the computer*