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Maturity tier — Then: Strongly recommended once the basics are done.
Implementation effort: Low – can be deployed through Group Policy after compatibility validation.
User impact: Low – minimal performance overhead; legacy SMB clients may experience compatibility issues.
SMB signing adds digital signatures to SMB communications, allowing clients and servers to verify that data has not been modified in transit. Enabling SMB signing helps protect against man-in-the-middle (MITM) attacks and unauthorized traffic manipulation.
Modern versions of Windows support SMB signing, but it may not be enforced by default on every system. Organizations should enable SMB signing on servers and clients where compatibility allows.
For enterprise environments, SMB signing should be combined with other Windows hardening measures such as SMBv1 removal and NTLM reduction.
Keep building momentum
Disable NetBIOS name resolution to reduce legacy attack surfaces, prevent name spoofing attacks, and encourage secure DNS-based name resolution.
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