* Updated deployment-vdi-windows-defender-antivirus.md * Updated deployment-vdi-windows-defender-antivirus.md * Updated deployment-vdi-windows-defender-antivirus.md * updates for new vdi stuff * Adding important note to solve #3493 * Update windows/security/identity-protection/hello-for-business/hello-hybrid-key-whfb-settings-dir-sync.md Co-Authored-By: Nicole Turner <39884432+nenonix@users.noreply.github.com> * Typo "<"→"<", ">"→">" https://docs.microsoft.com/en-us/windows/application-management/manage-windows-mixed-reality * Issue #2297 * Update windows/security/identity-protection/hello-for-business/hello-identity-verification.md Co-Authored-By: Nicole Turner <39884432+nenonix@users.noreply.github.com> * Clarification * Update windows/security/identity-protection/hello-for-business/hello-identity-verification.md Co-Authored-By: Nicole Turner <39884432+nenonix@users.noreply.github.com> * Update windows/security/identity-protection/hello-for-business/hello-identity-verification.md Co-Authored-By: Trond B. Krokli <38162891+illfated@users.noreply.github.com> * update troubleshoot-np.md * update configure-endpoints-gp.md * Removing a part which is not supported * Name change * update troubleshoot-np.md * removed on-premises added -hello * Added link into Domain controller guide * Line corections * corrected formatting of xml code samples When viewing the page in Win 10/Edge, the xml code samples stretched across the page, running into the side menu. The lack of line breaks also made it hard to read. This update adds line breaks and syntax highlighting, replaces curly double quotes with standard double quotes, and adds a closing tag for <appv:appconnectiongroup>for each code sample * Update windows/security/identity-protection/hello-for-business/hello-identity-verification.md Co-Authored-By: Nicole Turner <39884432+nenonix@users.noreply.github.com> * Update windows/deployment/update/waas-delivery-optimization-reference.md Co-Authored-By: Nicole Turner <39884432+nenonix@users.noreply.github.com> * Update windows/deployment/update/waas-delivery-optimization-reference.md Co-Authored-By: Nicole Turner <39884432+nenonix@users.noreply.github.com> * corrected formating of XML examples The XML samples here present the same formatting problems as in about-the-connection-group-file51.md (see https://github.com/MicrosoftDocs/windows-itpro-docs/pull/3847/) Perhaps we should open an issue to see if we have more versions of this code sample in the docs * corrected formatting of XML example section In the XML example on this page, the whitespace had been stripped out, so there were no spaces between adjacent attribute values or keys. This made it hard to read, though the original formatting allowed for a scroll bar, so the text was not running into the side of the page (compare to https://github.com/MicrosoftDocs/windows-itpro-docs/pull/3847 and https://github.com/MicrosoftDocs/windows-itpro-docs/pull/3850, where the uncorrected formatting forced the text to run into the side menu). * update configure-endpoints-gp.md * Fixed error in registry path and improved description * Update windows/security/identity-protection/hello-for-business/hello-hybrid-key-whfb-settings-dir-sync.md Co-Authored-By: Trond B. Krokli <38162891+illfated@users.noreply.github.com> * Removing extra line in 25 Suggested by * update windows-analytics-azure-portal.md * re: broken links, credential-guard-considerations Context: * #3513, MVA is being retired and producing broken links * #3860 Microsoft Virtual Academy video links This page contains two links to deprecated video content on Microsoft Virtual Academy (MVA). MVA is being retired. In addition, the Deep Dive course the two links point to is already retired, and no replacement course exists. I removed the first link, as I could not find a similar video available describing which credentials are covered by credential guard. I replaced the second link with a video containing similar material, though it is not a "deep dive". Suggestions on handling this problem, as many pages contain similar links, would be appreciated,. * removed link to retired video re: #3867 Context: * #3513, MVA is being retired and producing broken links * #3867, Microsoft Virtual Academy video links This page contains a broken link to deprecated video content on Microsoft Virtual Academy (MVA). MVA is being retired. In addition, the Deep Dive course is already retired, and no replacement course exists. I removed the whole _See Also_ section, as I could not find a video narrowly or deeply addressing how to protect privelaged users with Credential Guard. The most likely candidate is too short and general: https://www.linkedin.com/learning/cism-cert-prep-1-information-security-governance/privileged-account-management * addressing broken mva links, #3817 Context: * #3513, MVA is being retired and producing broken links * #3817, Another broken link This page contains two links to deprecated video content on Microsoft Virtual Academy (MVA). MVA is being retired. In addition, the Deep Dive course the two links point to is already retired, and no replacement course exists. I removed the first link, as we no longer have a video with similar content for a similar audience. The most likely candidate is https://www.linkedin.com/learning/programming-foundations-web-security-2/types-of-credential-attacks, which is more general and for a less technical audience. I removed the second link and the _See Also_ section, as I could not find a similar video narrowly focused on which credentials are covered by Credential Guard. Most of the related material available now describes how to perform a task. * Update deployment-vdi-windows-defender-antivirus.md * typo fix re: #3876; DMSA -> DSMA * Addressing dead MVA links, #3818 This page, like its fellows in the mva-links label, contains links to a retired video course on a website that is retiring soon. The links listed by the user in issue #3818 were also on several other pages, related to Credentials Guard. These links were addressed in the pull requests #3875, #3872, and #3871 Credentials threat & lateral threat link: removed (see PR #3875 for reasoning) Virtualization link: replaced (see #3871 for reasoning) Credentials protected link: removed (see #3872 for reasoning) * Adding notes for known issue in script Solves #3869 * Updated the download link admx files Windows 10 Added link for April 2018 and Oct 2018 ADMX files. * added event logs path Referenced : https://docs.microsoft.com/en-us/windows/security/threat-protection/windows-defender-exploit-guard/event-views-exploit-guard * Update browsers/internet-explorer/ie11-deploy-guide/administrative-templates-and-ie11.md Suggestions applied. Co-Authored-By: JohanFreelancer9 <48568725+JohanFreelancer9@users.noreply.github.com> * Update browsers/internet-explorer/ie11-deploy-guide/administrative-templates-and-ie11.md Co-Authored-By: JohanFreelancer9 <48568725+JohanFreelancer9@users.noreply.github.com> * Update deployment-vdi-windows-defender-antivirus.md * screenshot update * Add files via upload * update 4 scrrenshots * Update deployment-vdi-windows-defender-antivirus.md * Update browsers/internet-explorer/ie11-deploy-guide/administrative-templates-and-ie11.md Co-Authored-By: Nicole Turner <39884432+nenonix@users.noreply.github.com> * Update browsers/internet-explorer/ie11-deploy-guide/administrative-templates-and-ie11.md Co-Authored-By: Nicole Turner <39884432+nenonix@users.noreply.github.com> * Re: #3909 Top link is broken, #3909 > The link here does not work: > Applies to: Microsoft Defender Advanced Threat Protection (Microsoft Defender ATP) The link to the pdf describing MDATP was broken. Thankfully, PR #2897 updated the same link in another page some time ago, so I didn't have to go hunting for an equivalent * CI Update * Updated as per task 3405344 * Updated author * Update windows-analytics-azure-portal.md * added the example query * Updated author fields * Update office-csp.md * update video for testing * update video * Update surface-hub-site-readiness-guide.md line 134 Fixed video link MD formatting * fixing video url * updates from Albert * Bulk replaced author to manikadhiman * Bulk replaced ms.author to v-madhi * Latest content is published (#371) * Added 1903 policy DDF link and fixed a typo * Reverted the DDF version * Latest update (#375) * Update deployment-vdi-windows-defender-antivirus.md * Update deployment-vdi-windows-defender-antivirus.md
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title, description, ms.assetid, ms.reviewer, ms.author, ms.prod, ms.mktglfcycl, ms.sitesec, ms.pagetype, ms.localizationpriority, author, manager, audience, ms.collection, ms.topic, ms.date
title | description | ms.assetid | ms.reviewer | ms.author | ms.prod | ms.mktglfcycl | ms.sitesec | ms.pagetype | ms.localizationpriority | author | manager | audience | ms.collection | ms.topic | ms.date |
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Network security LAN Manager authentication level (Windows 10) | Describes the best practices, location, values, policy management and security considerations for the Network security LAN Manager authentication level security policy setting. | bbe1a98c-420a-41e7-9d3c-3a2fe0f1843e | dansimp | w10 | deploy | library | security | medium | dansimp | dansimp | ITPro | M365-security-compliance | conceptual | 04/19/2017 |
Network security: LAN Manager authentication level
Applies to
- Windows 10
Describes the best practices, location, values, policy management and security considerations for the Network security: LAN Manager authentication level security policy setting.
Reference
This policy setting determines which challenge or response authentication protocol is used for network logons. LAN Manager (LM) includes client computer and server software from Microsoft that allows users to link personal devices together on a single network. Network capabilities include transparent file and print sharing, user security features, and network administration tools. In Active Directory domains, the Kerberos protocol is the default authentication protocol. However, if the Kerberos protocol is not negotiated for some reason, Active Directory uses LM, NTLM, or NTLM version 2 (NTLMv2).
LAN Manager authentication includes the LM, NTLM, and NTLMv2 variants, and it is the protocol that is used to authenticate all client devices running the Windows operating system when they perform the following operations:
- Join a domain
- Authenticate between Active Directory forests
- Authenticate to domains based on earlier versions of the Windows operating system
- Authenticate to computers that do not run Windows operating systems, beginning with Windows 2000
- Authenticate to computers that are not in the domain
Possible values
- Send LM & NTLM responses
- Send LM & NTLM - use NTLMv2 session security if negotiated
- Send NTLM responses only
- Send NTLMv2 responses only
- Send NTLMv2 responses only. Refuse LM
- Send NTLMv2 responses only. Refuse LM & NTLM
- Not Defined
The Network security: LAN Manager authentication level setting determines which challenge/response authentication protocol is used for network logons. This choice affects the authentication protocol level that clients use, the session security level that the computers negotiate, and the authentication level that servers accept. The following table identifies the policy settings, describes the setting, and identifies the security level used in the corresponding registry setting if you choose to use the registry to control this setting instead of the policy setting.
Setting | Description | Registry security level |
---|---|---|
Send LM & NTLM responses | Client devices use LM and NTLM authentication, and they never use NTLMv2 session security. Domain controllers accept LM, NTLM, and NTLMv2 authentication. | 0 |
Send LM & NTLM – use NTLMv2 session security if negotiated | Client devices use LM and NTLM authentication, and they use NTLMv2 session security if the server supports it. Domain controllers accept LM, NTLM, and NTLMv2 authentication. | 1 |
Send NTLM response only | Client devices use NTLMv1 authentication, and they use NTLMv2 session security if the server supports it. Domain controllers accept LM, NTLM, and NTLMv2 authentication. | 2 |
Send NTLMv2 response only | Client devices use NTLMv2 authentication, and they use NTLMv2 session security if the server supports it. Domain controllers accept LM, NTLM, and NTLMv2 authentication. | 3 |
Send NTLMv2 response only. Refuse LM | Client devices use NTLMv2 authentication, and they use NTLMv2 session security if the server supports it. Domain controllers refuse to accept LM authentication, and they will accept only NTLM and NTLMv2 authentication. | 4 |
Send NTLMv2 response only. Refuse LM & NTLM | Client devices use NTLMv2 authentication, and they use NTLMv2 session security if the server supports it. Domain controllers refuse to accept LM and NTLM authentication, and they will accept only NTLMv2 authentication. | 5 |
Best practices
- Best practices are dependent on your specific security and authentication requirements.
Policy Location
Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options
Registry Location
HKLM\System\CurrentControlSet\Control\Lsa\LmCompatibilityLevel
Default values
The following table lists the actual and effective default values for this policy. Default values are also listed on the policy’s property page.
Server type or GPO | Default value |
---|---|
Default Domain Policy | Not defined |
Default Domain Controller Policy | Not defined |
Stand-Alone Server Default Settings | Send NTLMv2 response only |
DC Effective Default Settings | Send NTLMv2 response only |
Member Server Effective Default Settings | Send NTLMv2 response only |
Client Computer Effective Default Settings | Not defined |
Policy management
This section describes features and tools that are available to help you manage this policy.
Restart requirement
None. Changes to this policy become effective without a device restart when they are saved locally or distributed through Group Policy.
Group Policy
Modifying this setting may affect compatibility with client devices, services, and applications.
Security considerations
This section describes how an attacker might exploit a feature or its configuration, how to implement the countermeasure, and the possible negative consequences of countermeasure implementation.
Vulnerability
In Windows 7 and Windows Vista, this setting is undefined. In Windows Server 2008 R2 and later, this setting is configured to Send NTLMv2 responses only.
Countermeasure
Configure the Network security: LAN Manager Authentication Level setting to Send NTLMv2 responses only. Microsoft and a number of independent organizations strongly recommend this level of authentication when all client computers support NTLMv2.
Potential impact
Client devices that do not support NTLMv2 authentication cannot authenticate in the domain and access domain resources by using LM and NTLM.