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Connect to the ESX/ESXi host using the vSphere Client.
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Select a host in the inventory.
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Click the Configuration tab.
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Click Time Configuration.
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Click Properties.
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Click Options.
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Click NTP Settings.
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Click Add.
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Enter the NTP Server name. For example, pool.ntp.org.
Note: When entering the multiple NTP Server names, use a comma (,) followed by a space ( ) between the entries.
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Click OK.
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Click the General tab.
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Click Start automatically under Startup Policy.
Note: It is recommended to set the time manually prior to starting the service.
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Click Start and click OK.
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Click OK to exit.