diff --git a/education/windows/windows-editions-for-education-customers.md b/education/windows/windows-editions-for-education-customers.md index 80555a4b90..4197cf6869 100644 --- a/education/windows/windows-editions-for-education-customers.md +++ b/education/windows/windows-editions-for-education-customers.md @@ -30,10 +30,10 @@ Windows 10, version 1607 introduces two editions designed for the unique needs o Windows 10 Pro Education builds on the commercial version of Windows 10 Pro and provides important management controls needed in schools. Windows 10 Pro Education is effectively a variant of Windows 10 Pro that provides education-specific default settings. These default settings disable tips, tricks and suggestions & Microsoft Store suggestions. More detailed information on these default settings is available in [Manage Windows 10 and Microsoft Store tips, tricks, and suggestions](https://go.microsoft.com/fwlink/?LinkId=822627). -For Cortana[1](#footnote1), +For Cortana[1](#footnote1): - If you're using version 1607, Cortana is removed. -- If you're using new devices with version 1703, Cortana is turned on by default. -- If you're upgrading from version 1607 to version 1703, Cortana will be enabled. +- If you're using new devices with version 1703 or later, Cortana is turned on by default. +- If you're upgrading from version 1607 to version 1703 or later, Cortana will be enabled. You can use the **AllowCortana** policy to turn Cortana off. For more information, see [Windows 10 configuration recommendations for education customers](configure-windows-for-education.md). @@ -49,10 +49,10 @@ Customers who deploy Windows 10 Pro are able to configure the product to have si Windows 10 Education builds on Windows 10 Enterprise and provides the enterprise-grade manageability and security desired by many schools. Windows 10 Education is effectively a variant of Windows 10 Enterprise that provides education-specific default settings. These default settings disable tips, tricks and suggestions & Microsoft Store suggestions. More detailed information on these default settings is available in [Manage Windows 10 and Microsoft Store tips, tricks, and suggestions](https://go.microsoft.com/fwlink/?LinkId=822627). -For Cortana1, +For Cortana1: - If you're using version 1607, Cortana1 is removed. -- If you're using new devices with version 1703, Cortana is turned on by default. -- If you're upgrading from version 1607 to version 1703, Cortana will be enabled. +- If you're using new devices with version 1703 or later, Cortana is turned on by default. +- If you're upgrading from version 1607 to version 1703 or later, Cortana will be enabled. You can use the **AllowCortana** policy to turn Cortana off. For more information, see [Windows 10 configuration recommendations for education customers](configure-windows-for-education.md). diff --git a/windows/security/identity-protection/credential-guard/credential-guard-manage.md b/windows/security/identity-protection/credential-guard/credential-guard-manage.md index 32bf1aabaf..742dd80951 100644 --- a/windows/security/identity-protection/credential-guard/credential-guard-manage.md +++ b/windows/security/identity-protection/credential-guard/credential-guard-manage.md @@ -21,8 +21,7 @@ ms.custom: # Manage Windows Defender Credential Guard **Applies to** -- Windows 10 <=1903 Enterprise and Education SKUs -- Windows 10 >=1909 +- Windows 10 Enterprise or Education SKUs - Windows Server 2016 - Windows Server 2019 @@ -119,12 +118,15 @@ You can do this by using either the Control Panel or the Deployment Image Servic 2. Enable virtualization-based security: - Go to HKEY\_LOCAL\_MACHINE\\System\\CurrentControlSet\\Control\\DeviceGuard. + - Add a new DWORD value named **EnableVirtualizationBasedSecurity**. Set the value of this registry setting to 1 to enable virtualization-based security and set it to 0 to disable it. + - Add a new DWORD value named **RequirePlatformSecurityFeatures**. Set the value of this registry setting to 1 to use **Secure Boot** only or set it to 3 to use **Secure Boot and DMA protection**. 3. Enable Windows Defender Credential Guard: - Go to HKEY\_LOCAL\_MACHINE\\System\\CurrentControlSet\\Control\\LSA. + - Add a new DWORD value named **LsaCfgFlags**. Set the value of this registry setting to 1 to enable Windows Defender Credential Guard with UEFI lock, set it to 2 to enable Windows Defender Credential Guard without lock, and set it to 0 to disable it. 4. Close Registry Editor. @@ -145,6 +147,7 @@ DG_Readiness_Tool.ps1 -Enable -AutoReboot > [!IMPORTANT] > When running the HVCI and Windows Defender Credential Guard hardware readiness tool on a non-English operating system, within the script, change `$OSArch = $(gwmi win32_operatingsystem).OSArchitecture` to be `$OSArch = $((gwmi win32_operatingsystem).OSArchitecture).tolower()` instead, in order for the tool to work. +> > This is a known issue. ### Review Windows Defender Credential Guard performance @@ -171,6 +174,7 @@ DG_Readiness_Tool_v3.6.ps1 -Ready > [!IMPORTANT] > When running the HVCI and Windows Defender Credential Guard hardware readiness tool on a non-English operating system, within the script, change `*$OSArch = $(gwmi win32_operatingsystem).OSArchitecture` to be `$OSArch = $((gwmi win32_operatingsystem).OSArchitecture).tolower()` instead, in order for the tool to work. +> > This is a known issue. > [!NOTE] @@ -179,15 +183,25 @@ DG_Readiness_Tool_v3.6.ps1 -Ready - We recommend enabling Windows Defender Credential Guard before a device is joined to a domain. If Windows Defender Credential Guard is enabled after domain join, the user and device secrets may already be compromised. In other words, enabling Credential Guard will not help to secure a device or identity that has already been compromised, which is why we recommend turning on Credential Guard as early as possible. - You should perform regular reviews of the PCs that have Windows Defender Credential Guard enabled. This can be done with security audit policies or WMI queries. Here's a list of WinInit event IDs to look for: - - **Event ID 13** Windows Defender Credential Guard (LsaIso.exe) was started and will protect LSA credentials. - - **Event ID 14** Windows Defender Credential Guard (LsaIso.exe) configuration: \[**0x0** \| **0x1** \| **0x2**\], **0** - - The first variable: **0x1** or **0x2** means that Windows Defender Credential Guard is configured to run. **0x0** means that it's not configured to run. - - The second variable: **0** means that it's configured to run in protect mode. **1** means that it's configured to run in test mode. This variable should always be **0**. - - **Event ID 15** Windows Defender Credential Guard (LsaIso.exe) is configured but the secure kernel is not running; continuing without Windows Defender Credential Guard. - - **Event ID 16** Windows Defender Credential Guard (LsaIso.exe) failed to launch: \[error code\] - - **Event ID 17** Error reading Windows Defender Credential Guard (LsaIso.exe) UEFI configuration: \[error code\] - You can also verify that TPM is being used for key protection by checking Event ID 51 in the **Microsoft** -> **Windows** -> **Kernel-Boot** event source. If you are running with a TPM, the TPM PCR mask value will be something other than 0. - - **Event ID 51** VSM Master Encryption Key Provisioning. Using cached copy status: **0x0**. Unsealing cached copy status: 0x1. New key generation status: 0x1. Sealing status: **0x1**. TPM PCR mask: **0x0**. + + - **Event ID 13** Windows Defender Credential Guard (LsaIso.exe) was started and will protect LSA credentials. + + - **Event ID 14** Windows Defender Credential Guard (LsaIso.exe) configuration: \[**0x0** \| **0x1** \| **0x2**\], **0** + + - The first variable: **0x1** or **0x2** means that Windows Defender Credential Guard is configured to run. **0x0** means that it's not configured to run. + + - The second variable: **0** means that it's configured to run in protect mode. **1** means that it's configured to run in test mode. This variable should always be **0**. + + - **Event ID 15** Windows Defender Credential Guard (LsaIso.exe) is configured but the secure kernel is not running; continuing without Windows Defender Credential Guard. + + - **Event ID 16** Windows Defender Credential Guard (LsaIso.exe) failed to launch: \[error code\] + + - **Event ID 17** Error reading Windows Defender Credential Guard (LsaIso.exe) UEFI configuration: \[error code\] + + You can also verify that TPM is being used for key protection by checking Event ID 51 in the **Microsoft** -> **Windows** -> **Kernel-Boot** event source. If you are running with a TPM, the TPM PCR mask value will be something other than 0. + + - **Event ID 51** VSM Master Encryption Key Provisioning. Using cached copy status: **0x0**. Unsealing cached copy status: 0x1. New key generation status: 0x1. Sealing status: **0x1**. TPM PCR mask: **0x0**. + - You can use Windows PowerShell to determine whether credential guard is running on a client computer. On the computer in question, open an elevated PowerShell window and run the following command: ```powershell @@ -195,10 +209,13 @@ DG_Readiness_Tool_v3.6.ps1 -Ready ``` This command generates the following output: + - **0**: Windows Defender Credential Guard is disabled (not running) + - **1**: Windows Defender Credential Guard is enabled (running) - > [!NOTE] - > Checking the task list or Task Manager to see if LSAISO.exe is running is not a recommended method for determining whether Windows Defender Credential Guard is running. + + > [!NOTE] + > Checking the task list or Task Manager to see if LSAISO.exe is running is not a recommended method for determining whether Windows Defender Credential Guard is running. ## Disable Windows Defender Credential Guard @@ -207,12 +224,15 @@ To disable Windows Defender Credential Guard, you can use the following set of p 1. If you used Group Policy, disable the Group Policy setting that you used to enable Windows Defender Credential Guard (**Computer Configuration** -> **Administrative Templates** -> **System** -> **Device Guard** -> **Turn on Virtualization Based Security**). 2. Delete the following registry settings: + - HKEY\_LOCAL\_MACHINE\\System\\CurrentControlSet\\Control\\LSA\LsaCfgFlags - HKEY\_LOCAL\_MACHINE\\Software\\Policies\\Microsoft\\Windows\\DeviceGuard\\LsaCfgFlags 3. If you also wish to disable virtualization-based security delete the following registry settings: + - HKEY\_LOCAL\_MACHINE\\Software\\Policies\\Microsoft\\Windows\\DeviceGuard\\EnableVirtualizationBasedSecurity - HKEY\_LOCAL\_MACHINE\\Software\\Policies\\Microsoft\\Windows\\DeviceGuard\\RequirePlatformSecurityFeatures + > [!IMPORTANT] > If you manually remove these registry settings, make sure to delete them all. If you don't remove them all, the device might go into BitLocker recovery. @@ -261,6 +281,7 @@ DG_Readiness_Tool_v3.6.ps1 -Disable -AutoReboot > [!IMPORTANT] > When running the HVCI and Windows Defender Credential Guard hardware readiness tool on a non-English operating system, within the script, change `*$OSArch = $(gwmi win32_operatingsystem).OSArchitecture` to be `$OSArch = $((gwmi win32_operatingsystem).OSArchitecture).tolower()` instead, in order for the tool to work. +> > This is a known issue. #### Disable Windows Defender Credential Guard for a virtual machine diff --git a/windows/security/identity-protection/credential-guard/credential-guard-requirements.md b/windows/security/identity-protection/credential-guard/credential-guard-requirements.md index ec08c99def..2e56e0803c 100644 --- a/windows/security/identity-protection/credential-guard/credential-guard-requirements.md +++ b/windows/security/identity-protection/credential-guard/credential-guard-requirements.md @@ -58,11 +58,11 @@ For information about Windows Defender Remote Credential Guard hardware and soft When Windows Defender Credential Guard is enabled, specific authentication capabilities are blocked, so applications that require such capabilities will break. Applications should be tested prior to deployment to ensure compatibility with the reduced functionality. ->[!WARNING] +> [!WARNING] > Enabling Windows Defender Credential Guard on domain controllers is not supported. > The domain controller hosts authentication services which integrate with processes isolated when Windows Defender Credential Guard is enabled, causing crashes. ->[!NOTE] +> [!NOTE] > Windows Defender Credential Guard does not provide protections for the Active Directory database or the Security Accounts Manager (SAM). The credentials protected by Kerberos and NTLM when Windows Defender Credential Guard is enabled are also in the Active Directory database (on domain controllers) and the SAM (for local accounts). Applications will break if they require: @@ -140,7 +140,7 @@ The following table lists qualifications for Windows 10, version 1703, which are > [!IMPORTANT] > ->Regarding **VBS enablement of NX protection for UEFI runtime services**: +> Regarding **VBS enablement of NX protection for UEFI runtime services**: > > - This only applies to UEFI runtime service memory, and not UEFI boot service memory. > diff --git a/windows/security/identity-protection/remote-credential-guard.md b/windows/security/identity-protection/remote-credential-guard.md index 373339ebcd..60dc685e1e 100644 --- a/windows/security/identity-protection/remote-credential-guard.md +++ b/windows/security/identity-protection/remote-credential-guard.md @@ -53,7 +53,7 @@ Use the following table to compare different Remote Desktop connection security
-| **Feature** | **Remote Desktop** | **Windows Defender Remote Credential Guard** | **Restricted Admin mode** | +| Feature | Remote Desktop | Windows Defender Remote Credential Guard | Restricted Admin mode | |--------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | **Protection benefits** | Credentials on the server are not protected from Pass-the-Hash attacks. | User credentials remain on the client. An attacker can act on behalf of the user *only* when the session is ongoing | User logs on to the server as local administrator, so an attacker cannot act on behalf of the “domain user”. Any attack is local to the server | | **Version support** | The remote computer can run any Windows operating system | Both the client and the remote computer must be running **at least Windows 10, version 1607, or Windows Server 2016**. | The remote computer must be running **at least patched Windows 7 or patched Windows Server 2008 R2**.

For more information about patches (software updates) related to Restricted Admin mode, see [Microsoft Security Advisory 2871997](https://technet.microsoft.com/library/security/2871997.aspx). | @@ -67,7 +67,7 @@ Use the following table to compare different Remote Desktop connection security
For further technical information, see [Remote Desktop Protocol](https://msdn.microsoft.com/library/aa383015(v=vs.85).aspx) -and [How Kerberos works](https://technet.microsoft.com/library/cc961963.aspx(d=robot)) +and [How Kerberos works](https://technet.microsoft.com/library/cc961963.aspx(d=robot)).
@@ -92,9 +92,12 @@ To use Windows Defender Remote Credential Guard, the Remote Desktop client and r The Remote Desktop client device: -- Must be running at least Windows 10, version 1703 to be able to supply credentials, which is sent to the remote device. This allows users to run as different users without having to send credentials to the remote machine. +- Must be running at least Windows 10, version 1703 to be able to supply credentials, which is sent to the remote device. This allows users to run as different users without having to send credentials to the remote machine. + - Must be running at least Windows 10, version 1607 or Windows Server 2016 to use the user’s signed-in credentials. This requires the user’s account be able to sign in to both the client device and the remote host. + - Must be running the Remote Desktop Classic Windows application. The Remote Desktop Universal Windows Platform application doesn't support Windows Defender Remote Credential Guard. + - Must use Kerberos authentication to connect to the remote host. If the client cannot connect to a domain controller, then RDP attempts to fall back to NTLM. Windows Defender Remote Credential Guard does not allow NTLM fallback because this would expose credentials to risk. The Remote Desktop remote host: @@ -108,9 +111,13 @@ There are no hardware requirements for Windows Defender Remote Credential Guard. > [!NOTE] > Remote Desktop client devices running earlier versions, at minimum Windows 10 version 1607, only support signed-in credentials, so the client device must also be joined to an Active Directory domain. Both Remote Desktop client and server must either be joined to the same domain, or the Remote Desktop server can be joined to a domain that has a trust relationship to the client device's domain. +> +> GPO [Remote host allows delegation of non-exportable credentials](https://docs.microsoft.com/windows/client-management/mdm/policy-csp-credentialsdelegation) should be enabled for delegation of non-exportable credentials. - For Windows Defender Remote Credential Guard to be supported, the user must authenticate to the remote host using Kerberos authentication. + - The remote host must be running at least Windows 10 version 1607, or Windows Server 2016. + - The Remote Desktop classic Windows app is required. The Remote Desktop Universal Windows Platform app doesn't support Windows Defender Remote Credential Guard. ## Enable Windows Defender Remote Credential Guard @@ -118,15 +125,20 @@ There are no hardware requirements for Windows Defender Remote Credential Guard. You must enable Restricted Admin or Windows Defender Remote Credential Guard on the remote host by using the Registry. 1. Open Registry Editor on the remote host. + 2. Enable Restricted Admin and Windows Defender Remote Credential Guard: + - Go to HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Lsa. + - Add a new DWORD value named **DisableRestrictedAdmin**. + - To turn on Restricted Admin and Windows Defender Remote Credential Guard, set the value of this registry setting to 0 to turn on Windows Defender Remote Credential Guard. + 3. Close Registry Editor. You can add this by running the following command from an elevated command prompt: -``` +```console reg add HKLM\SYSTEM\CurrentControlSet\Control\Lsa /v DisableRestrictedAdmin /d 0 /t REG_DWORD ``` @@ -143,6 +155,7 @@ Beginning with Windows 10 version 1703, you can enable Windows Defender Remote C ![Windows Defender Remote Credential Guard Group Policy](images/remote-credential-guard-gp.png) 3. Under **Use the following restricted mode**: + - If you want to require either [Restricted Admin mode](https://social.technet.microsoft.com/wiki/contents/articles/32905.remote-desktop-services-enable-restricted-admin-mode.aspx) or Windows Defender Remote Credential Guard, choose **Restrict Credential Delegation**. In this configuration, Windows Defender Remote Credential Guard is preferred, but it will use Restricted Admin mode (if supported) when Windows Defender Remote Credential Guard cannot be used. > [!NOTE] @@ -163,7 +176,7 @@ Beginning with Windows 10 version 1703, you can enable Windows Defender Remote C If you don't use Group Policy in your organization, or if not all your remote hosts support Remote Credential Guard, you can add the remoteGuard parameter when you start Remote Desktop Connection to turn on Windows Defender Remote Credential Guard for that connection. -``` +```console mstsc.exe /remoteGuard ``` diff --git a/windows/security/identity-protection/user-account-control/how-user-account-control-works.md b/windows/security/identity-protection/user-account-control/how-user-account-control-works.md index 560f4b240c..254e57e0e9 100644 --- a/windows/security/identity-protection/user-account-control/how-user-account-control-works.md +++ b/windows/security/identity-protection/user-account-control/how-user-account-control-works.md @@ -109,9 +109,7 @@ To better understand each component, review the table below: Description - -

User

- +User @@ -138,9 +136,7 @@ To better understand each component, review the table below: - -

System

- +System @@ -248,8 +244,7 @@ To better understand each component, review the table below: - -

Kernel

+Kernel @@ -276,9 +271,11 @@ The slider will never turn UAC completely off. If you set it to Never notify< - Cause all elevation request initiated by administrators to be auto-approved without showing a UAC prompt. - Automatically deny all elevation requests for standard users. -> **Important:** In order to fully disable UAC you must disable the policy **User Account Control: Run all administrators in Admin Approval Mode**. -> -> **Warning:** Universal Windows apps will not work when UAC is disabled. +> [!IMPORTANT] +> In order to fully disable UAC you must disable the policy **User Account Control: Run all administrators in Admin Approval Mode**. + +> [!WARNING] +> Some Universal Windows Platform apps may not work when UAC is disabled. ### Virtualization @@ -291,7 +288,9 @@ Most app tasks operate properly by using virtualization features. Although virtu Virtualization is not an option in the following scenarios: - Virtualization does not apply to apps that are elevated and run with a full administrative access token. + - Virtualization supports only 32-bit apps. Non-elevated 64-bit apps simply receive an access denied message when they attempt to acquire a handle (a unique identifier) to a Windows object. Native Windows 64-bit apps are required to be compatible with UAC and to write data into the correct locations. + - Virtualization is disabled if the app includes an app manifest with a requested execution level attribute. ### Request execution levels @@ -319,6 +318,8 @@ Before a 32-bit process is created, the following attributes are checked to dete - Key attributes in the resource script data are linked in the executable file. - There are targeted sequences of bytes within the executable file. -> **Note:** The keywords and sequences of bytes were derived from common characteristics observed from various installer technologies. -> -> **Note:** The User Account Control: Detect application installations and prompt for elevation policy setting must be enabled for installer detection to detect installation programs. For more info, see [User Account Control security policy settings](user-account-control-security-policy-settings.md). +> [!NOTE] +> The keywords and sequences of bytes were derived from common characteristics observed from various installer technologies. + +> [!NOTE] +> The User Account Control: Detect application installations and prompt for elevation policy setting must be enabled for installer detection to detect installation programs. For more info, see [User Account Control security policy settings](user-account-control-security-policy-settings.md). diff --git a/windows/security/information-protection/kernel-dma-protection-for-thunderbolt.md b/windows/security/information-protection/kernel-dma-protection-for-thunderbolt.md index 2d8554f52b..836d7916f5 100644 --- a/windows/security/information-protection/kernel-dma-protection-for-thunderbolt.md +++ b/windows/security/information-protection/kernel-dma-protection-for-thunderbolt.md @@ -82,20 +82,24 @@ Beginning with Windows 10 version 1809, you can use Security Center to check if ### Using System information 1. Launch MSINFO32.exe in a command prompt, or in the Windows search bar. + 2. Check the value of **Kernel DMA Protection**. + ![Kernel DMA protection in System Information](bitlocker/images/kernel-dma-protection.png) + 3. If the current state of **Kernel DMA Protection** is OFF and **Hyper-V - Virtualization Enabled in Firmware** is NO: + - Reboot into BIOS settings - Turn on Intel Virtualization Technology. - Turn on Intel Virtualization Technology for I/O (VT-d). In Windows 10 version 1803, only Intel VT-d is supported. Other platforms can use DMA attack mitigations described in [BitLocker countermeasures](bitlocker/bitlocker-countermeasures.md). - Reboot system into Windows 10. ->[!NOTE] -> **Hyper-V - Virtualization Enabled in Firmware** is NOT shown when **A hypervisor has been detected. Features required for Hyper-V will not be displayed.** is shown because this means that **Hyper-V - Virtualization Enabled in Firmware** is YES. + >[!NOTE] + > **Hyper-V - Virtualization Enabled in Firmware** is NOT shown when **A hypervisor has been detected. Features required for Hyper-V will not be displayed.** is shown because this means that **Hyper-V - Virtualization Enabled in Firmware** is YES and the **Hyper-V** Windows feature is enabled. Enabling both is needed to enable **Kernel DMA Protection** even when the firmware has the flag of "ACPI Kernel DMA Protection Indicators" described in [Kernel DMA Protection (Memory Access Protection) for OEMs](https://docs.microsoft.com/windows-hardware/design/device-experiences/oem-kernel-dma-protection). 4. If the state of **Kernel DMA Protection** remains Off, then the system does not support this feature. -For systems that do not support Kernel DMA Protection, please refer to the [BitLocker countermeasures](bitlocker/bitlocker-countermeasures.md) or [Thunderbolt™ 3 and Security on Microsoft Windows® 10 Operating system](https://thunderbolttechnology.net/security/Thunderbolt%203%20and%20Security.pdf) for other means of DMA protection. + For systems that do not support Kernel DMA Protection, please refer to the [BitLocker countermeasures](bitlocker/bitlocker-countermeasures.md) or [Thunderbolt™ 3 and Security on Microsoft Windows® 10 Operating system](https://thunderbolttechnology.net/security/Thunderbolt%203%20and%20Security.pdf) for other means of DMA protection. ## Frequently asked questions diff --git a/windows/security/threat-protection/auditing/basic-audit-logon-events.md b/windows/security/threat-protection/auditing/basic-audit-logon-events.md index 5c7672c13a..66c1906086 100644 --- a/windows/security/threat-protection/auditing/basic-audit-logon-events.md +++ b/windows/security/threat-protection/auditing/basic-audit-logon-events.md @@ -38,33 +38,12 @@ You can configure this security setting by opening the appropriate policy under | Logon events | Description | | - | - | -| 528 | A user successfully logged on to a computer. For information about the type of logon, see the Logon Types table below. | -| 529 | Logon failure. A logon attempt was made with an unknown user name or a known user name with a bad password. | -| 530 | Logon failure. A logon attempt was made user account tried to log on outside of the allowed time. | -| 531 | Logon failure. A logon attempt was made using a disabled account. | -| 532 | Logon failure. A logon attempt was made using an expired account. | -| 533 | Logon failure. A logon attempt was made by a user who is not allowed to log on at this computer. | -| 534 | Logon failure. The user attempted to log on with a type that is not allowed. | -| 535 | Logon failure. The password for the specified account has expired. | -| 536 | Logon failure. The Net Logon service is not active. | -| 537 | Logon failure. The logon attempt failed for other reasons. | -| 538 | The logoff process was completed for a user. | -| 539 | Logon failure. The account was locked out at the time the logon attempt was made. | -| 540 | A user successfully logged on to a network. | -| 541 | Main mode Internet Key Exchange (IKE) authentication was completed between the local computer and the listed peer identity (establishing a security association), or quick mode has established a data channel. | -| 542 | A data channel was terminated. | -| 543 | Main mode was terminated. | -| 544 | Main mode authentication failed because the peer did not provide a valid certificate or the signature was not validated. | -| 545 | Main mode authentication failed because of a Kerberos failure or a password that is not valid. | -| 546 | IKE security association establishment failed because the peer sent a proposal that is not valid. A packet was received that contained data that is not valid. | -| 547 | A failure occurred during an IKE handshake. | -| 548 | Logon failure. The security ID (SID) from a trusted domain does not match the account domain SID of the client. | -| 549 | Logon failure. All SIDs corresponding to untrusted namespaces were filtered out during an authentication across forests. | -| 550 | Notification message that could indicate a possible denial-of-service attack. | -| 551 | A user initiated the logoff process. | -| 552 | A user successfully logged on to a computer using explicit credentials while already logged on as a different user. | -| 682 | A user has reconnected to a disconnected terminal server session. | -| 683 | A user disconnected a terminal server session without logging off. | +| 4624 | A user successfully logged on to a computer. For information about the type of logon, see the Logon Types table below. | +| 4625 | Logon failure. A logon attempt was made with an unknown user name or a known user name with a bad password. | +| 4634 | The logoff process was completed for a user. | +| 4647 | A user initiated the logoff process. | +| 4648 | A user successfully logged on to a computer using explicit credentials while already logged on as a different user. | +| 4779 | A user disconnected a terminal server session without logging off. | When event 528 is logged, a logon type is also listed in the event log. The following table describes each logon type.