Windows ntp

Configuring Windows Time service to use an internal hardware clock

To configure the Windows Time service to use an internal hardware clock, you can change the announce flag on the authoritative time server. Changing the announce flag forces the computer to announce itself as a reliable time source and to use the built-in complementary metal oxide semiconductor (CMOS) clock. To configure the Windows Time service to use an internal hardware clock, follow these steps.

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

  1. Click Start, click Run, type regedit, and then click OK.
  2. Locate and then click the following registry entry:
     HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Config\
  3. In the right pane, right-click AnnounceFlags, and then click Modify.
  4. In the Edit DWORD Value dialog box, under Value data, type 5, and then click OK.
  5. Enable NTPServer.
        1. Locate and then click the following registry subkey:
           HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\TimeProviders\NtpServer\
        2. In the right pane, right-click Enabled, and then click Modify.
        3. In the Edit DWORD Value dialog box, type 1 under Value data, and then click OK.
  6. Exit Registry Editor.
  7. At the command prompt, type the following command to restart the Windows Time service, and then press ENTER:
     net stop w32time && net start w32time
  8. To reset the local computers' time against the time server, run the following command on all the computers except the time server:
     w32tm /resync /rediscover