There are no Security Audit Event policies that can be configured to view output from this policy. 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. Reducing and eliminating NTLM authentication from your environment forces the Windows operating system to use more secure protocols, such as the Kerberos version 5 protocol, or different authentication mechanisms, such as smart cards.
Malicious attacks on NTLM authentication traffic resulting in a compromised server or domain controller can occur only if the server or domain controller handles NTLM requests. If those requests are denied, this attack vector is eliminated. When it has been determined that the NTLM authentication protocol should not be used within a network because you are required to use a more secure protocol such as the Kerberos protocol, then you can select one of several options that this security policy setting offers to restrict NTLM usage within the domain.
If you configure this policy setting, numerous NTLM authentication requests could fail within the domain, which could degrade productivity. Before implementing this change through this policy setting, set Network security: Restrict NTLM: Audit NTLM authentication in this domain to the same option so that you can review the log for the potential impact, perform an analysis of servers, and create an exception list of servers to exclude from this policy setting by using Network security: Restrict NTLM: Add server exceptions in this domain.
Skip to main content. This browser is no longer supported. Modifying this setting may affect compatibility with client computers, services, and applications. 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. In Windows 7 and Windows Vista, this setting is undefined. The default setting on servers allows all client computers to authenticate with servers and use their resources.
However, this means that LM responses—the weakest form of authentication response—are sent over the network, and it is potentially possible for attackers to intercept that traffic to reproduce the user's password more easily. The Windows 95, Windows 98, and Windows NT operating systems cannot use Kerberos protocol version 5 for authentication. For this reason, in a Windows Server domain, these computers authenticate by default with both the LM and NTLM protocols for network authentication.
For the logon process, NTLMv2 uses a secure channel to protect the authentication process. Even if you use NTLMv2 for client computers and servers running these early versions of the Windows operating system, Windows-based client computers and servers that are members of the domain use the Kerberos protocol to authenticate with Windows Server domain controllers.
What is active directory. Active Directory. Active Directory Training. Active directory introduction. Related Books Free with a 30 day trial from Scribd. Related Audiobooks Free with a 30 day trial from Scribd. Elizabeth Howell. How Group Policy works now Not limited to policy-aware applications Ease of administration through rich UI Better targeting New in Windows 7 Support for new Power Plan settings Support for new Schedule task triggers, actions, etc.
Nothing happen Are there any schema changes required? What about the Vista Central Store? Will ADMX create an impact on my policies? Is it actually stored any differently? Do you still use the same tools to diagnose replication issues like Ultrasound FRS? With the move from Winlogon to a service does this mean users can deny policy applying? All rights reserved. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation.
Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation.
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