AOSX-13-000330 - The macOS system must, for networked systems, compare internal information system clocks at least every 24 hours with a server that is synchronized to one of the redundant United States Naval Observatory (USNO) time servers or a time server designated for the appropriate DoD network (NIPRNet/SIPRNet) and/or the Global Positioning System (GPS).


Inaccurate time stamps make it more difficult to correlate events and can lead to an inaccurate analysis. Determining the correct time a particular event occurred on a system is critical when conducting forensic analysis and investigating system events. Sources outside of the configured acceptable allowance (drift) may be inaccurate.

Synchronizing internal information system clocks provides uniformity of time stamps for information systems with multiple system clocks and systems connected over a network.

Organizations should consider endpoints that may not have regular access to the authoritative time server (e.g., mobile, teleworking, and tactical endpoints).

Satisfies: SRG-OS-000355-GPOS-00143, SRG-OS-000356-GPOS-00144


To enable the NTP service, run the following command:

/usr/bin/sudo /bin/launchctl load -w /System/Library/LaunchDaemons/

To configure one or more time servers for use, edit '/etc/ntp.conf' and enter each hostname or IP address on a separate line, prefixing each one with the keyword 'server'.

See Also

Item Details


References: 800-53|AU-8(1)(a), 800-53|AU-8(1)(b), CAT|II, CCI|CCI-001891, CCI|CCI-002046, Rule-ID|SV-214838r609363_rule, STIG-ID|AOSX-13-000330, STIG-Legacy|SV-96251, STIG-Legacy|V-81537, Vuln-ID|V-214838

Plugin: Unix

Control ID: a0062f48748015bd25408c69ff3bcd49e51b3daeed31d1597c0224b98a0c9a9d