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Event ID 4615: Invalid use of LPC port

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

Invalid use of LPC port.

Event 4615
Security-Auditing
Security log
Audit
Message and fields (as Event Viewer shows them) 
Invalid use of LPC port.

Subject:
	Security ID:		…
	Account Name:		…
	Account Domain:		…
	Logon ID:		…

Process Information:
	PID:			…
	Name:			…

Invalid Use:		…

LPC Server Port Name:	…

Windows Local Security Authority (LSA) communicates with the Windows kernel using Local Procedure Call (LPC) ports. If you see this event, an application has inadvertently or intentionally accessed this port which is reserved exclusively for LSA's use. The application (process) should be investigated to ensure that it is not attempting to tamper with this communications channel.