Event ID 812: The winlogon notification subscriber <…> finished handling the notification event
Windows Event ID Lookup: What Windows event IDs mean: 4625, 4624, 4740, 6008, 41, 7045, 1102 and 3,000 more, with Windows' own message text, the fields and what to check.
Look up a Windows event ID from Event Viewer, a SIEM alert or a log export: what it means, the fields it records, and what to check. Many IDs are used by more than one source (event 41 is both a Kernel-Power crash and a boot error), so every definition is shown, the one people usually mean first. The message text is Windows' own, read from the event providers of Windows 10.0.26200.0, 2026-10-28; the notes are ours, based on Microsoft's security auditing reference.
The winlogon notification subscriber <…> finished handling the notification event
Event 812
Winlogon
System log
Information
MFND namespace page map control failed.
Event 812
StorPort
System log
Error
End reenumeration of device tree below
Event 812
Kernel-PnP
System log
Information