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0x800706D3 Error − Authentication Service Is Unknown

Symptom​

Either of the following errors is prompted in Health Log for file server monitoring plans in Netwrix Auditor:

Source:	File Storage Audit Service
Event ID:6104
Description:Monitoring plan: %File_Servers_Monitoring_Plan% 
Item: %item_name%
Unable to process item: Cannot connect to file server (0x800706D3 The authentication service is unknown).
Backup event log seek failed. Error details: Access is denied
Failed to open the event log. Error details: The requested operation is not supported. Error code: 800706e4

Cause​

Microsoft released security updates KB5003646/KB5003638 to fix security vulnerabilities. These updates installed in Windows Server 2019 servers would affect the Netwrix Auditor data collection. Learn more about the updates in KB5003646 · Microsoft Support.

Resolution​

Upgrade your Netwrix Auditor instance to v10.5.11059 or the latest version available. Refer to the following article for additional information on the upgrade process: Installation − Upgrade to the Latest Version · v10.6.