Synchronize ESX and ESXi Clocks with a Network Time Server

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. From the vSphere Web Client, connect to the vCenter Server.
2. Select the host in the inventory.
3. Select the Manage tab.
4. Select Settings.
5. In the System section, select Time Configuration.
6. Click Edit and set up the NTP server.
   1. Select Use Network Time Protocol (Enable NTP client).
   2. Set the NTP Service Startup Policy.
   3. Enter the IP addresses of the NTP servers to synchronize with.
   4. Click Start or Restart in the NTP Service Status section.
7. Click OK.

   The host synchronizes with the NTP server.