To configure SMB NTLM blocking with exceptions for certain remote devices, enable the group policy under:Ĭomputer Configuration \ Administrative Templates \ Network \ Lanman Workstation \ Block NTLM Server Exception List To configure SMB NTLM blocking for the entire Windows machine, enable the group policy under:Ĭomputer Configuration \ Administrative Templates \ Network \ Lanman Workstation \ Block NTLM (LM, NTLM, NTLMv2) You can also block NTLM SMB connections on demand with NET USE and PowerShell. You can configure this option with Group Policy and PowerShell. This allows an administrator to configure a general block on NTLM usage while still allowing clients to use NTLM for specific servers that do not support Kerberos, either because they are not Active Directory domain joined or are a third party without Kerberos support. Starting with Build 25992, the new SMB NTLM blocking feature now supports specifying exception lists for NTLM usage. Read about it at The evolution of Windows authentication. These combined options mean the beginning of the end for NTLM. Update Oct 11, 2023: We also just announced that a new local KDC is coming to Windows Insider Previews along with a replacement for KDC Proxy called IAKerb. mapping a drive locally on a device with a local account. Note: This setting has no effect on loopback SMB NTLM usage, i.e. This adds a new level of protection for enterprises without a requirement to entirely disable NTLM usage in the OS. An attacker who tricks a user or application into sending NTLM challenge responses to a malicious server will no longer receive any NTLM data and cannot brute force, crack, or pass hashes. With this new option, an administrator can intentionally block Windows from offering NTLM via SMB. NTLM in this case refers to all versions of the LAN Manager security package: LM, NTLM, and NTLMv2. This changes legacy behavior, where Windows SPNEGO would negotiate Kerberos, NTLM, and other mechanisms with the destination server to decide on a supported security package. Heya folks, Ned here again. Beginning in Windows 11 Insider Preview Build 25951 (Canary), the SMB client now supports blocking NTLM for remote outbound connections.
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