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FIX: Time synchronization failed with time.windows.com

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  1. Press Windows Key + X to open the Win+X menu and choose Command Prompt (Admin).
    error-occurred-windows-synchronizing-time-windows-com-cmd-1
  2. When Command Prompt starts, enter the following commands:
    • w32tm /debug /disable
    • w32tm /unregister
    • w32tm /register
    • net start w32time
  3. If everything was successful, you should see “The windows Time Service is starting. The windows time service was started successfully.” message.
  4. Close Command Prompt and try to synchronize your clock.

Can’t access Command Prompt as an admin? Check out this guide.


5. Disable your third-party firewall

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Firewall tools are always useful because they prevent potentially dangerous applications from accessing the Internet. Unfortunately, sometimes these tools can interfere with your clock and cause this error to appear.

To fix this error, be sure to temporarily disable your firewall and check if that fixes the problem. If the issue persists, you might want to uninstall your firewall completely.

Users reported that after switching to Standard mode in their firewall or after disabling it completely, they were able to synchronize their clock without any problems.

In addition, you might want to configure your firewall to unlock NPT access on UDP port 123. If you changed your router’s firewall configuration, you might have to unlock UDP port 123 on your router as well.

Do you need to configure your router? Modify any settings easily with these software tools.


Check if your Firewall is blocking a port or an app with some steps from this guide.


6. Change the default update interval

  1. Press Windows Key + R and enter regedit.
  2. Press Enter or click OK.
    reg-1 an error occurred while windows was synchronizing with time.windows.com
  3. When Registry Editor starts, navigate to the following key in the left pane:
    • HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesW32TimeTimeProvidersNtpClient .
  4. Double click the SpecialPollInterval key.
    reg-2 an error occurred while windows was synchronizing with time.windows.com
  5. In the Base section select Decimal.
    • By default Value, data should be set to 604800.
    • This number represents 7 days in seconds, but you can change it to 86400 so it represents 1 day.
  6. After doing that, click OK to save changes.
    reg-3

Sometimes these errors can occur due to your update interval, but you can easily fix this error by changing few values in your registry.

We have to warn you that modifying your registry can lead to system stability issues if you don’t do it properly, therefore you might want to create a backup of your registry just in case.


Can’t access the Registry Editor? Check out this guide and solve the issue quickly.


7. Add more servers to the registry

  1. Open Registry Editor and navigate to the following key in the left pane:
    • HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionDateTimeServers
  2. You should see several values available in the right pane. Every server will be represented by a number.
  3. To add a new time server, right-click the empty space and choose New > String Value.
    new-1 an error occurred while windows was synchronizing with time.windows.com
  4. Enter the appropriate number as the name, in our case that’s 3 since we already have 3 servers available, and double click it.
  5. In the Value data field enter the server‘s address. Users reported that tick.usno.navy.mil server worked for them, so you can add it if you want.
  6. Click OK to save changes.
    new-2 an error occurred while windows was synchronizing with time.windows.com
  7. Optional: You can add as many servers as you want by following the previous steps. Regarding the servers, you can add any of these:
    • time-a.nist.gov
    • time-b.nist.gov
    • 128.105.37.11
    • europe.pool.ntp.org
    • clock.isc.org
    • north-america.pool.ntp.org
    • time.windows.com
    • time.nist.gov

After you add servers to the registry, simply go to Time and Date settings and choose any of the servers that you added. For more information on how to change a time server, be sure to check Solution 2 for detailed instructions.


8. Change registry values

  1. Open Registry Editor and navigate to the following key in the left pane:
    • HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesW32TimeConfig
  2. In right pane double click on MaxNegPhaseCorrection and set the Value data to ffffff.
  3. Click OK to save changes.
    config-1
  4. Double click on MaxPosPhaseCorrection and set Value data to ffffff. Click OK to save changes.
    config-2 an error occurred while windows was synchronizing with time.windows.com
  5. Close Registry Editor.

Can’t edit your registry? Take a look at this step-by-step guide!


Users reported that you can fix this problem simply by changing two values in your registry. After doing that, try to synchronize your clock again. Before trying this solution it’s recommended to back up your registry in case anything goes wrong.

An error occurred while Windows was synchronizing with time.windows.com error can prevent your clock from synchronizing, but you can easily solve this problem by changing your time server or by using any other of our solutions.

If you have any more questions or suggestions, feel free to drop them in the comments section below.

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This post was written by Milan Stanojevic and was first posted to WindowsReport

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