The Windows SMB client is not enabled to perform SMB packet signing when possible.

From Windows 7 Security Technical Implementation Guide

Part of SMB Client Packet Signing (if server agrees)

Associated with IA controls: ECSC-1

SV-25055r1_rule The Windows SMB client is not enabled to perform SMB packet signing when possible.

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 (if server agrees)” to “Enabled”.

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