![]() ![]() In a domain, Kerberos is the default authentication protocol. You can use Security Policy settings or Group Policies to manage NTLM authentication usage between computer systems. NTLM cannot be configured from Server Manager. There is no removed or deprecated functionality for NTLM for Windows Server 2012. There are no changes in functionality for NTLM for Windows Server 2012. For information about how to analyze and restrict NTLM usage in your environments, see Introducing the Restriction of NTLM Authentication to access the Auditing and restricting NTLM usage guide. New tools and settings have been added to help you discover how NTLM is used in order to selectively restrict NTLM traffic. Reducing the usage of the NTLM protocol in an IT environment requires both the knowledge of deployed application requirements on NTLM and the strategies and steps necessary to configure computing environments to use other protocols. Kerberos version 5 authentication is the preferred authentication method for Active Directory environments, but a non-Microsoft or Microsoft application might still use NTLM. NTLM authentication is also used for local logon authentication on non-domain controllers. ![]() NTLM authentication is still supported and must be used for Windows authentication with systems configured as a member of a workgroup. Look up the computer's or user's account in the local account database, if the account is a local account. When the NTLM protocol is used, a resource server must take one of the following actions to verify the identity of a computer or user whenever a new access token is needed:Ĭontact a domain authentication service on the domain controller for the computer's or user's account domain, if the account is a domain account. The NTLM authentication protocols authenticate users and computers based on a challenge/response mechanism that proves to a server or domain controller that a user knows the password associated with an account. ![]() The NTLM authentication protocols include LAN Manager version 1 and 2, and NTLM version 1 and 2. NTLM authentication is a family of authentication protocols that are encompassed in the Windows Msv1_0.dll. ![]() This topic for the IT professional describes NTLM, any changes in functionality, and provides links to technical resources to Windows Authentication and NTLM for Windows Server 2012 and previous versions. Applies to: Windows Server 2022, Windows Server 2019, Windows Server 2016 ![]()
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