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Event ID: 515 Source: Security

Source
Description
A trusted logon process has registered with the Local Security Authority.
This logon process will be trusted to submit logon requests.

Logon Process Name: <logon process name>
Comments
 
As per Microsoft: "This event record indicates that a logon process has registered with the Local Security Authority (LSA). In addition, logon requests will now be accepted from this source. Logon processes are trusted components responsible for collecting identification and authentication information from external devices, such as terminals and networks. They use Local Security Authority services to log these users on. A single system can simultaneously support multiple logon processes". See MSW2KDB or T957087 for more details on this event.
This event record indicates that a logon process has registered with the Local Security Authority (LSA). Also, logon requests will now be accepted from this source.Logon processes are trusted components responsible for collecting identification and authentication information from external devices, such as terminals and networks. They use Local Security Authority services to log these users on. A single system can simultaneously support multiple logon processes.

Typical logon processes:
- "msv1_0" or "MICROSOFT_AUTHENTICATION_PACKAGE_V1_0": msv1_0.dll, the
default authentication package
- "KSecDD": ksecdd.sys, the security device driver
- "User32" or "WinLogon\MSGina": winlogon.exe & msgina.dll, the authentication
user interface
- "SCMgr": The Service Control Manager
- "LAN Manager Workstation Service"
- "advapi" API call to LogonUser
- "MS.RADIU": The RADIUS authentication package; a part of the Microsoft
Internet Authentication Services (IAS).
- "WDigest": wdigest.dll

See the link to Windows Authentication Packages for information about the algorithms used by the logon processes.

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