PCI DSS 10.6.1: Synchronize System Clocks Using Time Technology
System clock accuracy is critical for PCI DSS compliance—it enables accurate audit logs, security event correlation, and regulatory investigations. Control 10.6.1 requires time-synchronization technology like NTP to keep all systems synchronized within acceptable tolerances. Without proper clock synchronization, your organization cannot reliably track security events or prove compliance during audits.
What this means
This control mandates that all system clocks across your environment be synchronized using time-synchronization protocols such as Network Time Protocol (NTP). Synchronized clocks ensure that log timestamps are accurate and consistent, which is essential for detecting and investigating security incidents. The requirement applies to all systems that generate audit logs or participate in security monitoring.
How to comply
- 1.Deploy NTP servers or use reliable external time sources within your network architecture
- 2.Configure all systems (servers, network devices, workstations) to synchronize with NTP servers
- 3.Set clock drift tolerance limits (typically ±1 second or less) and monitor for deviations
- 4.Use authenticated NTP where available to prevent time-based attacks
- 5.Document your time synchronization architecture and configuration standards
- 6.Test clock synchronization regularly to verify all systems remain synchronized
- 7.Configure centralized logging to capture synchronization events and clock adjustments
Evidence auditors look for
- NTP server configuration files showing peer or pool definitions
- Client system ntpd or NTP service logs showing successful synchronization
- Network configuration documentation identifying authoritative time sources
- Monitoring dashboard screenshots showing real-time clock offset metrics
- Audit logs with consistent timestamps across distributed systems
- Change management records for NTP updates or configuration changes
- Proof of regular synchronization testing and validation results
Frequently asked questions
When will FAQs be available?
The FAQ for this control is currently being prepared.
GRCWatch automatically discovers all systems in your environment, deploys NTP configuration templates, monitors real-time clock drift across your infrastructure, and generates compliance reports proving synchronization for your PCI DSS 10.6.1 audit.
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