An account was logged off
An account was logged off. Indicates that an existing authentication session was terminated or destroyed.
Event ID 4634 documents that a user session has ended and its associated Logon ID token has been cleared. It pairs with Event ID 4624 using the unique `Logon ID` hexadecimal identifier, allowing analysts to calculate exact active session durations.
Failure Reason / Root Cause:
User explicit logoff, RDP disconnection, automated service completion, or system shutdown.
Raw Event XML snippet
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-Security-Auditing" Guid="{54849625-5478-4994-A5BA-3E3B0328C30D}" />
<EventID>4634</EventID>
<Version>0</Version>
<Level>0</Level>
<Task>12544</Task>
<Opcode>0</Opcode>
<Keywords>0x8020000000000000</Keywords>
<TimeCreated SystemTime="2026-07-17T09:54:44.862Z" />
<EventRecordID>1048576</EventRecordID>
<Correlation />
<Execution ProcessID="612" ThreadID="1024" />
<Channel>Security</Channel>
<Computer>DC01.enterprise.internal</Computer>
<Security />
</System>
<EventData>
<Data Name="SubjectUserSid">S-1-5-18</Data>
<Data Name="SubjectUserName">SYSTEM</Data>
<Data Name="SubjectDomainName">NT AUTHORITY</Data>
<Data Name="SubjectLogonId">0x3e7</Data>
<!-- Event telemetry fields specific to An account was logged off -->
</EventData>
</Event>Recommended actions
- Use `Logon ID` matching between 4624 and 4634 to calculate active session timeframes during incident investigations.
- Note that 4634 occurs frequently during normal network share access (`Logon Type 3`) where sessions close immediately after file reads.