How do i turn off ntlm

Skip to main content. Find threads, tags, and users Would turning this off mess with the logins of all domain users? Current Visibility: Visible to all users. Thank you sorry I attached my post as a separate instead of a comment. Thanks for the speedy reply. Comment Show 0. Hello MitchellPaulen , Thank you for posting here. Hope the information provided by DSPatrick is helpful to you. Hope the information above is helpful. Some applications require to be slightly reconfigured to use Kerberos authentication see the articles Kerberos Authentication in IIS , How to configure different browsers for Kerberos authentication?

From my own experience, I see that even large commercial products are still using NTLM instead of Kerberos, some products require updates or configuration changes. It is all about detecting what apps are using NTLM authentication, and now you have the relevant method to identify this software and devices.

Those apps that cannot use Kerberos may be added to the exceptions. This will allow them to use NTLM authentication, even if it is disabled at the domain level. Add the names of the servers, on which NTLM authentication can be used, to the list of exceptions as well. Ideally, this exception list should be empty. Thus, you can verify if Kerberos user authentication works correctly in different apps. It shows you that there is an application still using NTLMv1. Disabling NTLM immediately can have broken an application.

The task of blocking NTLM must be implemented in several steps. First, it must be determined which systems and services still use NTLM.

The audit settings should be enabled, and the logs analysed over months with the goal of finding incorrect configurations and reducing NTLM use. For systems that continue to depend on NTLM , exception lists can be documented and configured. Afterwards, NTLM can be disabled within the domain. The hurdle to block NTLM is high, it is not an easy task to achieve and there is a risk of failures. But given the many attacks and vulnerabilities in NTLM , the security benefit is so substantial that it is worth tackling the project.

It is time to say goodbye to NTLM. Michael Schneider has been in IT since Since he is focused on information security. He is an expert at penetration testing , hardening and the detection of vulnerabilities in operating systems. He is well-known for a variety of tools written in PowerShell to find, exploit, and mitigate weaknesses. ORCID Hostname IP address dc01 You want more?

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