You can set the NTP servers that are used to synchronize the clock on your GitHub Enterprise installation, or you can use the default Ubuntu NTP servers (0.ubuntu.pool.ntp.org and 1.ubuntu.pool.ntp.org).
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Open the Management Console settings in a browser window.
http(s)://hostname/setup/settings
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From the left sidebar, select Time.

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Type the name of your primary and (optionally) secondary NTP servers.

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At the bottom of the page, click Save settings.

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Wait for the configuration run to complete.
