The Windows Server 2025 setting Microsoft network client: Digitally sign communications (if server agrees) must be configured to Enabled.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-278211 | SRG-OS-000423-GPOS-00187 | WN25-SO-000170 | SV-278211r1181339_rule | 2026-02-20 | 1 |
Description
The server message block (SMB) protocol provides the basis for many network operations. If this policy is enabled, the SMB client will request packet signing when communicating with an SMB server that is enabled or required to perform SMB packet signing.
Satisfies: SRG-OS-000423-GPOS-00187, SRG-OS-000424-GPOS-00188
ℹ️ Check
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: EnableSecuritySignature
Value Type: REG_DWORD
Value: 0x00000001 (1)
✔️ Fix
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".