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Event ID: 7021 Source: HealthService

Source
Level
Description
The Health Service was unable to validate any accounts in management group <management group name>.
Comments
 
1. Backup the registry key:

HKLM\SYSTEM\CurrentControlSet\Services\HealthService\Parameters\Management Groups\WKPOC\SSDB\SSIDs

2. Delete everything under SSIDs(keys, values, etc), i.e. leave empty SSIDs key
3. Restart HealthService (you can use these commands: net stop HealthService, net start HealthService)

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