How to Disable NTLM Authentication in Windows Domain?

NTLM (NT LAN Manager) has been used as the basic Microsoft authentication protocol for quite a long time: since Windows NT. Although Microsoft introduced a more secure Kerberos authentication protocol in Windows 2000, the NTLM (generally, it is NTLMv2) is still widely used for authentication on Windows domain networks. In this article, we’ll consider how to disable NTLMv1 and NTLMv2 protocols and start using Kerberos in your Active Directory domain.

The main NTLMv1 problems:

weak encryption;
storing password hash in the memory of the LSA service that can be extracted using different tools (like mimikatz) and then the hash may be used for further attacks;
the absence of mutual authentication between a server and a client that results in data interception attacks and unauthorized access to network resources (some tools such as Responder can capture NTLM data sent over the network and use them to access the network resources);
and other vulnerabilities.
Some of them were fixed in the next version NTLMv2 which uses more secure encryption algorithms and allows to prevent popular NTLM attacks. NTLMv1 and LM authentification protocols are disabled by default starting with Windows 7 / Windows Server 2008 R2.

If you have thought about stopping the use of NTLM in your domain, first of all, you must make sure that you are not using its more vulnerable version – NTLMv1. Your network may have a number of legacy devices or services that are still using NTLMv1 authentication instead of NTLMv2 (or Kerberos). So, prior to disabling it completely, read the NTLM authentication event audit section in this article.

find more information : lan manager authentication level

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