ESXi 5.1 configured as a NTP server, do not sync with the Local PC

I have a 5.1 ESXi server configured as an NTP server and a Windows Server 2008 R2 local PC that are not sync.  I understand well, it is not recommended for ESXi, but I read [1] [2] that, whenever an ESXi server is running as a client, it also acts as a server, so I enabled as a NTP client in vSphere by ticking the NTP client, adding some servers to the server list, and then click on run, and I also activated the 123 incoming/outgoing port by adding the shell of ESXi firewall settings.

I'm pretty sure it isn't a firewall problem.  I completely disabled the firewall on my local PC.  Running "w32tm keyboardists computers: - IP address of the server -" give me the time of the server and running the software NTPQuery gives me an answer back on port 123 of the server time.

I tried:

- Date/time settings (right-click on notification area-> set date/time-> Internet time-> set as the IP address of the server) - sync fails (* an error has occurred while Windows timed with - server IP-*)

- Group Policy Editor (Computer Configuration\Administrative Templates administration\systeme\service Time Service, currently disabled but because I heard this causes problems) - synchronization fails

- The registry editor (HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\W32Time\settings) - synchronization fails

- Command prompt, using:

w32tm /config /manualpeerlist:-IP of server- /syncfromflags:MANUAL /reliable:yes /update
net stop w32time && net start w32time
w32tm /resync /rediscover


This updates the registry properly, but the outputs "the computer did not resync because no time data was available."  And when I use the command "w32tm/query/source" the source is always "The local CMOS clock."

Here is the output from w32tm/query /configuration

    [Configuration]


    EventLogFlags: 2 (Local)
    AnnounceFlags: 5 (Local)
    TimeJumpAuditOffset: 28800 (Local)
    MinPollInterval: 10 (Local)
    MaxPollInterval: 15 (Local)
    MaxNegPhaseCorrection: 3600 (Local)
    MaxPosPhaseCorrection: 3600 (Local)
    MaxAllowedPhaseOffset: 1 (Local)
  
    FrequencyCorrectRate: 4 (Local)
    PollAdjustFactor: 5 (Local)
    LargePhaseOffset: 50000000 (Local)
    SpikeWatchPeriod: 900 (Local)
    LocalClockDispersion: 10 (Local)
    HoldPeriod: 5 (Local)
    PhaseCorrectRate: 1 (Local)
    UpdateInterval: 360000 (Local)


  
    [TimeProviders]
  
    NtpClient (Local)
    DllName: C:\windows\system32\w32time.dll (Loca
    Enabled: 1 (Local)
    InputProvider: 1 (Local)
    AllowNonstandardModeCombinations: 1 (Local)
    ResolvePeerBackoffMinutes: 15 (Local)
    ResolvePeerBackoffMaxTimes: 7 (Local)
    CompatibilityFlags: 2147483648 (Local)
    EventLogFlags: 1 (Local)
    LargeSampleSkew: 3 (Local)
    SpecialPollInterval: 900 (Local)
    Type: NTP (Local)
    NtpServer: -IP of server-,0x1 (Local)
  
    NtpServer (Local)
    DllName: C:\windows\system32\w32time.dll (Loca
    Enabled: 1 (Local)
    InputProvider: 0 (Local)
    AllowNonstandardModeCombinations: 1 (Local)


Any ideas?  Thanks in advance.

Your ESXi server response shows that the leap indicator is 3 and the server stratum is 0.

This means that ESXi NTP server is synchronized and unable to provide a valid reference time to customers.

We recommend that you configure your ESXi host with valid upstream NTP servers such as:

0.vmware.pool.ntp.org,1.vmware.pool.ntp.org and 2. VMware.pool.ntp.org

as described in the KB article or alternatively your internet service provider NTP servers.

Although not recommended, you can configure ESXi to allow a reference time by using the own system clock

If you can not configure ESXi to synchronize to external NTP servers upstream.

UI, tab Configuration, using software (time setting), properties, Options, and NTP settings.

Specify "127.127.1.0" as your single NTP server. Don't forget to check the box "restart NTP service to apply the changes.

then click OK twice to close the dialog boxes. Wait a few minutes for NTP sync, then try your test.

According to RFC 4330, NTP-SNTP (Simple) customers must not use time in a package of NTP response if the

stratum returned is 0 (and the leap indicator is 3). Apparently, your client Windows NTP Simple is more

the RFC.

Tags: VMware

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