The Windows SMB server will perform SMB packet signing when possible.

From Windows Server 2008 R2 Member Server Security Technical Implementation Guide

Part of SMB Server Packet Signing (if client agrees)

Associated with IA controls: ECSC-1

SV-32513r1_rule The Windows SMB server will perform SMB packet signing when possible.

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If this policy is enabled, it causes the Windows Server Message Block (SMB) server to perform SMB packet signing.

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Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> “Microsoft Network Server: Digitally sign communications (if Client agrees)” to “Enabled”.

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