Windows Server 2019 setting Microsoft network client: Digitally sign communications (always) must be configured to Enabled.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-205825 | WN19-SO-000160 | SV-205825r958908_rule | CCI-002418 | medium |
| Description | ||||
| The server message block (SMB) protocol provides the basis for many network operations. Digitally signed SMB packets aid in preventing man-in-the-middle attacks. If this policy is enabled, the SMB client will only communicate with an SMB server that performs SMB packet signing. Satisfies: SRG-OS-000423-GPOS-00187, SRG-OS-000424-GPOS-00188 | ||||
| STIG | Date | |||
| Microsoft Windows Server 2019 Security Technical Implementation Guide | 2025-05-23 | |||
Details
Check Text (C-205825r958908_chk)
If the following registry value does not exist or is not configured as specified, this is a finding:
Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters\
Value Name: RequireSecuritySignature
Value Type: REG_DWORD
Value: 0x00000001 (1)
Fix Text (F-6090r355838_fix)
Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Microsoft network client: Digitally sign communications (always)" to "Enabled".