Before you install vCenter Server or deploy the vCenter Server Appliance, make sure all machines on your vSphere network have their clocks synchronized.

This task explains how to set up NTP from the vSphere Client. You can instead use the vicfg-ntp vCLI command. See the vSphere Command-Line Interface Reference.


  1. Start the vSphere Client, and connect to the ESXi host.
  2. On the Configuration tab, click Time Configuration.
  3. Click Properties, and click Options.
  4. Select NTP Settings.
  5. Click Add.
  6. In the Add NTP Server dialog box, enter the IP address or fully qualified domain name of the NTP server to synchronize with.
  7. Click OK.
    The host time synchronizes with the NTP server.