What is it?
Event ID 4624 represents a successful logon and Event ID 4625 represents a failed logon.
RR CYBERLAB • Windows Security
Windows Event ID 4624 & 4625
Learn how successful and failed Windows logon events support authentication investigations.
QUICK READ
Start with the key points below. If you want the deeper technical context, work through the investigation sections.
Why security cares
Repeated failures, unusual source systems or a successful login immediately after many failures can provide useful investigation context.
What to check
Review username, source IP, time, logon type, authentication method, host and activity immediately before and after the login.
Quick example
Twenty-five failures from one source followed by a successful login should trigger investigation, but the events alone do not prove compromise.
Key takeaway
Authentication investigations should focus on patterns and context, not one event in isolation.