Why does a windows XP domain client default to having NTP server enabled

ntpwindows-server-2003windows-xp

On a windows XP client that is a member of a domain, resetting the Windows time service to defaults (w32tm /unregister, w32tm /register) enables the NTP server on the XP machine itself.

(HKLM\System\CurrentControlSet\Services\W32Time\TimeProviders\NtpServer\Eanbled = 1)

It also says this in the MS docs on WTS registry settings here:
http://technet.microsoft.com/en-us/library/cc773263(WS.10).aspx

The server shows as being enabled by doing a "netstat -a":

UDP XP-PC:ntp :

Why?

Is there any harm in disabling it?

Best Answer

IF the XP machine is a part of the domain, it's going to pull it's clock from the DC running the PDC Emulator anyway. I don't think there is any harm with leaving it, or changing it if you really feel the need.