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Event ID: 540 Source: Security

Source
Description
Successful Network Logon:
    User Name: <user name>
    Domain: <domain name>
    Logon ID: <logon id>
    Logon Type: <logon type>
    Logon Process: <logon process>
    Authentication Package: <authentication package>
    Workstation Name: <computer name>

or

Successful Network Logon:
    User Name: <user name>
    Domain: <domain name>
    Logon ID: (0x0,0x43F6E)
    Logon Type: 3
    Logon Process: <logon process>
    Authentication Package: <authentication package>

    Workstation Name:
        Logon GUID: {107e155b-e3f6-0532-996a-c0e40ed3e5f5}
        Caller User Name: -
        Caller Domain: -
        Caller Logon ID: -
        Caller Process ID: -
        Transited Services: -
        Source Network Address: <workstation ip address>
        Source Port: <port number>
Comments
 
This event indicates that a remote user has successfully connected from the network to a local resource on the server, generating a token for the network user. For example, mapping a drive to a network share or logging with an account whose profile has a drive mapping would generate this auditing message.

See the links to Windows Logon Types, Windows Authentication Packages and Windows Logon Processes for information about these fields. Understanding how the logon took place (through what channels) is quite important in understanding this event.

This event may also be reported for builtin accounts. Whenever a user logs in the associated builtin accounts are also logged in. The HelpAssistant account in Windows XP is one such account. Even if the Remote Assistance Service is disabled, the account will still login. This is not a potential security violation as the HelpAssistant account itself is disabled. See ME300692.
This event informs you that a logon session was created for the user. For information on the details accompanying the event (logon ID, logon GUID, etc.) see MSW2KDB.

See ME287537, ME326985, for additional information on this event.

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