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.


  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.