The clocks of all servers on the vSphere network must be synchronized. You can configure a Windows NTP client as a source for clock synchronization on Windows servers.
Use the registry editor on the Windows server to make the configuration changes.
Procedure
1
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a
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Go to the registry setting HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Parameters
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b
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Set the Type value to NTP.
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2
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a
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Go to the registry setting HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Config
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b
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Set the AnnounceFlags value to 5.
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3
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Enter the upstream NTP servers to synchronize from.
a
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Go to the registry setting HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\TimeProviders.
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b
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Set the NtpServer value to a list of at least three NTP servers.
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For example, you might set the value to 0x1 1.pool.ntp.org,0x1 2.pool.ntp.org,0x1 3.pool.ntp.org.
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4
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Specify a 150-minute update interval.
a
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Go to the registry setting HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\TimeProviders\NtpClient,
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b
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Set the SpecialPollInterval value to 900.
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5
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Restart the W32time service for the changes to take effect.
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