The Windows Server SMB client is not enabled to always perform SMB packet signing.

From Windows 2003 Member Server Security Technical Implementation Guide

Part of SMB Client Packet Signing (Always)

Associated with IA controls: ECSC-1

SV-29383r1_rule The Windows Server SMB client is not enabled to always perform SMB packet signing.

Vulnerability discussion

If this policy is enabled, it causes the Windows Server Message Block (SMB) client to perform SMB packet signing when communicating with an SMB server that is enabled or required 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 Client: Digitally sign communications (always)” to “Enabled”.

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