![]() Potential impactĬlient devices that don't support NTLMv2 authentication can't authenticate in the domain and access domain resources by using LM and NTLM.Working at ComPsych not only gives you the opportunity to work for the global leader in Employee Assistance Programs, but also the chance to make a difference in lives every day. Microsoft and many independent organizations strongly recommend this level of authentication when all client computers support NTLMv2. CountermeasureĬonfigure the Network security: LAN Manager Authentication Level setting to Send NTLMv2 responses only. In Windows Server 2008 R2 and later, this setting is configured to Send NTLMv2 responses only. In Windows 7 and Windows Vista, this setting is undefined. 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. Modifying this setting may affect compatibility with client devices, services, and applications. Changes to this policy become effective without a device restart when they're saved locally or distributed through Group Policy. This section describes features and tools that are available to help you manage this policy. Server type or GPOĬlient Computer Effective Default Settings Default values are also listed on the policy’s property page. The following table lists the actual and effective default values for this policy. HKLM\System\CurrentControlSet\Control\Lsa\LmCompatibilityLevel Default values Best practices are dependent on your specific security and authentication requirements.Ĭomputer Configuration\Windows Settings\Security Settings\Local Policies\Security Options Registry Location.Domain controllers refuse to accept LM and NTLM authentication, and they'll accept only NTLMv2 authentication. Refuse LM & NTLMĬlient devices use NTLMv2 authentication, and they use NTLMv2 session security if the server supports it. Domain controllers refuse to accept LM authentication, and they'll accept only NTLM and NTLMv2 authentication. Domain controllers accept LM, NTLM, and NTLMv2 authentication.Ĭlient devices use NTLMv2 authentication, and they use NTLMv2 session security if the server supports it. Domain controllers accept LM, NTLM, and NTLMv2 authentication.Ĭlient devices use NTLMv1 authentication, and they use NTLMv2 session security if the server supports it. Send LM & NTLM – use NTLMv2 session security if negotiatedĬlient 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. SettingĬlient devices use LM and NTLM authentication, and they never use NTLMv2 session security. 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. This choice affects the authentication protocol level that clients use, the session security level that the computers negotiate, and theĪuthentication level that servers accept. The Network security: LAN Manager authentication level setting determines which challenge/response authentication protocol is used for network logons. Send LM & NTLM - use NTLMv2 session security if negotiated.Authenticate to computers that aren't in the domain.Authenticate to computers that don't run Windows operating systems, beginning with Windows 2000.Authenticate to domains based on earlier versions of the Windows operating system.Authenticate between Active Directory forests.LAN Manager authentication includes the LM, NTLM, and NTLMv2 variants, and it's the protocol that is used to authenticate all client devices running the Windows operating system when they perform the following operations: However, if the Kerberos protocol isn't negotiated for some reason, Active Directory uses LM, NTLM, or NTLM version 2 (NTLMv2). ![]() In Active Directory domains, the Kerberos protocol is the default authentication protocol. Network capabilities include transparent file and print sharing, user security features, and network administration tools. LAN Manager (LM) includes client computer and server software from Microsoft that allows users to link personal devices together on a single network. This policy setting determines which challenge or response authentication protocol is used for network logons. Describes the best practices, location, values, policy management and security considerations for the Network security: LAN Manager authentication level security policy setting.
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