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Event ID 811: The winlogon notification subscriber <…> began 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.

Try: 4625, 4624, 4740, 6008, 41, 1074, 7045, 1102, 4104, 1149

The winlogon notification subscriber <…> began handling the notification event

Event 811
Winlogon
System log
Information
Message and fields (as Event Viewer shows them) 
The winlogon notification subscriber <…> began handling the notification event (…).

MFND namespace write failed.

Event 811
StorPort
System log
Error
Message and fields (as Event Viewer shows them) 
MFND namespace write failed.                    
Adapter port number: …                    
Adapter Guid: …                    
Miniport driver name: …                    
Adapter SerialNumber: …                    
MFND interface name: …                    
PCI vendor ID: …                    
PCI subsystem vendor ID: …                    
Product ID: …                    
Firmware revision: …                    
Operation mode: …                    
Operation privilege: …                    
Namespace ID: …                    
Starting LBA: …                    
LBA count: …                    
Flags: …                    
Data size to write: …                    
Command status code (SC): …                    
Command status code type (SCT): …                    
NtStatus: …

Begin reenumeration of device tree below

Event 811
Kernel-PnP
System log
Information
Message and fields (as Event Viewer shows them) 
Begin reenumeration of device tree below ….