Event ID 4624: An account was successfully logged on
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.
Someone (or something) logged on to this computer. Every logon creates one, including services, scheduled tasks and network share access, so the Logon Type field is what tells them apart.
What to check: Filter on Logon Type (10 for Remote Desktop, 3 for network, 2 for at the keyboard) and on Source Network Address to find who connected from where. Unexpected type 10 or 3 logons from outside your network deserve a look.
Logon types
2
Interactive
At the keyboard (or a KVM / console session).
3
Network
Access over the network: file shares, IIS with Windows authentication, most remote management.
4
Batch
A scheduled task or batch job.
5
Service
A service started under this account.
7
Unlock
The workstation was unlocked.
8
NetworkCleartext
Network logon with the password sent in clear text (IIS basic authentication, some scripts). Worth eliminating.
9
NewCredentials
runas /netonly: the local identity stays, other credentials are used for network access.
10
RemoteInteractive
Remote Desktop (Terminal Services) logon.
11
CachedInteractive
Logon with cached domain credentials, without reaching a domain controller (laptops off the network).
An account was successfully logged on.
Subject:
Security ID: …
Account Name: …
Account Domain: …
Logon ID: …
Logon Information:
Logon Type: …
Restricted Admin Mode: …
Remote Credential Guard: …
Virtual Account: …
Elevated Token: …
Impersonation Level: …
New Logon:
Security ID: …
Account Name: …
Account Domain: …
Logon ID: …
Linked Logon ID: …
Network Account Name: …
Network Account Domain: …
Logon GUID: …
Process Information:
Process ID: …
Process Name: …
Network Information:
Workstation Name: …
Source Network Address: …
Source Port: …
Detailed Authentication Information:
Logon Process: …
Authentication Package: …
Transited Services: …
Package Name (NTLM only): …
Key Length: …
This event is generated when a logon session is created. It is generated on the computer that was accessed.
The subject fields indicate the account on the local system which requested the logon. This is most commonly a service such as the Server service, or a local process such as Winlogon.exe or Services.exe.
The logon type field indicates the kind of logon that occurred. The most common types are 2 (interactive) and 3 (network).
The New Logon fields indicate the account for whom the new logon was created, i.e. the account that was logged on.
The network fields indicate where a remote logon request originated. Workstation name is not always available and may be left blank in some cases.
The impersonation level field indicates the extent to which a process in the logon session can impersonate.
The authentication information fields provide detailed information about this specific logon request.
- Logon GUID is a unique identifier that can be used to correlate this event with a KDC event.
- Transited services indicate which intermediate services have participated in this logon request.
- Package name indicates which sub-protocol was used among the NTLM protocols.
- Key length indicates the length of the generated session key. This will be 0 if no session key was requested.