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Event ID 273: BCD Option '…' was not applied due to Secure Boot being enabled

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

BCD Option '…' was not applied due to Secure Boot being enabled.

Event 273
Kernel-Boot
System log
Warning
Message and fields (as Event Viewer shows them) 
BCD Option '…' was not applied due to Secure Boot being enabled. Option: …

A leap second will be … at … UTC (… local time).

Event 273
Time-Service
System log
Information
Message and fields (as Event Viewer shows them) 
A leap second will be … at … UTC (… local time). The local system data on this leap second matches with the data from the time provider ….
System Tick Count: ….

For more information, see https://go.microsoft.com/fwlink/?linkid=845961.

Unit directed power down completed.

Event 273
StorPort
System log
Information
Message and fields (as Event Viewer shows them) 
Unit directed power down completed.

Begin unloading driver database

Event 273
Kernel-PnP
System log
Information
Message and fields (as Event Viewer shows them) 
Begin unloading driver database …

Connection with ID … for session … has completed, total time … (ms), stack time … (ms)

Event 273
TerminalServices-RemoteConnectionManager
TerminalServices-RemoteConnectionManager/Operational log
Information
Message and fields (as Event Viewer shows them) 
Connection with ID … for session … has completed, total time … (ms), stack time … (ms)