Before you install vCenter Single Sign-On, the vSphere Web Client, or the vCenter Server Appliance, make sure all machines on the vSphere network have their clocks synchronized.
- Start the vSphere Client, and connect to the ESXi host.
- On the Configuration tab, click Time Configuration.
- Click Properties, and click Options.
- Select NTP Settings.
- Click Add.
- In the Add NTP Server dialog box, enter the IP address or fully qualified domain name of the NTP server to synchronize with.
- Click OK.
The host time synchronizes with the NTP server.