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← Back to Microsoft Windows 11 Security Technical Implementation Guide

V-253296

CAT III (Low)

The Windows 11 time service must synchronize with an appropriate DOD time source.

Rule ID

SV-253296r1051041_rule

STIG

Microsoft Windows 11 Security Technical Implementation Guide

Version

V2R7

CCIs

CCI-004923CCI-001891

Discussion

The Windows Time Service controls time synchronization settings. Time synchronization is essential for authentication and auditing purposes. If the Windows Time Service is used, it must synchronize with a secure, authorized time source. Domain-joined systems are automatically configured to synchronize with domain controllers. If an NTP server is configured, it must synchronize with a secure, authorized time source.

Check Content

Review the Windows time service configuration.

Open an elevated "Command Prompt" (run as administrator).

Enter "W32tm /query /configuration".

Domain-joined systems (excluding the domain controller with the PDC emulator role):

If the value for "Type" under "NTP Client" is not "NT5DS", this is a finding.

Fix Text

Configure the system to synchronize time with an appropriate DOD time source.

Domain-joined systems use NT5DS to synchronize time from other systems in the domain by default.

If the system needs to be configured to an NTP server, configure the system to point to an authorized time server by setting the policy value for Computer Configuration >> Administrative Templates >> System >> Windows Time Service >> Time Providers >> "Configure Windows NTP Client" to "Enabled", and configure the "NtpServer" field to point to an appropriate DOD time server.

The US Naval Observatory operates stratum 1 time servers, identified at https://www.cnmoc.usff.navy.mil/Our-Commands/United-States-Naval-Observatory/Precise-Time-Department/Network-Time-Protocol-NTP/. Time synchronization will occur through a hierarchy of time servers down to the local level. Clients and lower-level servers will synchronize with an authorized time server in the hierarchy.