VMware ESXi Time Synchronization and Clock Skew Troubleshooting

Establish the reference time

Identify the authoritative time source for the environment. In a domain-integrated design, confirm the expected Windows time hierarchy and how VMware infrastructure consumes time.

Check ESXi time configuration

Review the configured NTP servers and service state on each host. Do not mix multiple conflicting time sources without understanding which one should be authoritative.

Check network reachability

NTP uses UDP. Confirm that the ESXi management network can reach the configured time source and that firewall rules permit the required traffic.

Compare timestamps

Compare vCenter, ESXi, domain controllers and affected workloads. A consistent offset points toward the time source or network path, while a single-host offset points toward host configuration.

Check after reboot or maintenance

Verify that time synchronization persists after ESXi maintenance, host reboot and network changes.

Validate dependent services

After correcting time, retest Kerberos, certificates, vCenter connectivity and scheduled jobs that were affected by clock skew.

esxcli system ntp get
esxcli system ntp test
esxcli system time get

Quick checklist

• Establish the reference time
• Check ESXi time configuration
• Check network reachability
• Compare timestamps
• Check after reboot or maintenance
• Validate dependent services

Primary reference

This TechRunbook guide is independently written and cross-checked against Broadcom VMware documentation. View the reference →