Windows 2003 Server atransando ou adiantando hora?

No Windows 2003 Server a atualização de Data e Hora (datetime) é realizada
por um serviço chamado `w32time`, que sincroniza a data e hora no servidor
de domínio (NT5DS) por ou um servidor externo na Internet (NTP)

Stratum

Description

1

Locally connected hardware clock (optional)

Internet time server (optional)

2

PDC Emulator in forest root domain

3

Other domain controllers in forest root domain

PDC Emulators in child domains

4

Workstations and member servers in forest root domain

Other domain controllers in child domains

5

Workstations and member servers in child domains

Synching to an External Time Source

If you want to ensure that the clocks on your machines are more accurate in
terms of absolute (and not just relative) time, you can sync the PDC
Emulator in your forest root domain to one of the reliable time servers
available on the Internet. This is a good idea if your company is a large
enterprise with sites spanning several countries, or if your organization
has two or more forests linked by forest trusts. The procedure for doing
this on a PDC Emulator running Windows Server 2003 in the forest root domain
is as follows. Open Registry Editor (regedit.exe) and configure the
following registry entries:

HKLM\SYSTEM\CurrentControlSet\Services\W32Time\Parameters\Type

This registry entry determines which peers W32Time will accept
synchronization from. Change this REG_SZ value from NT5DS to NTP so the PDC
Emulator synchronizes from the list of reliable time servers specified in
the NtpServer registry entry described below.

HKLM\SYSTEM\CurrentControlSet\Services\W32Time\Config\AnnounceFlags

This registry entry controls whether the local computer is marked as a
reliable time server (which is only possible if the previous registry entry
is set to NTP as described above). Change this REG_DWORD value from 10 to 5
here.

HKLM\SYSTEM\CurrentControlSet\Services\W32Time\Parameters\NtpServer

This registry entry specifies a space-delimited list of stratum 1 time
servers from which the local computer can obtain reliable time stamps. The
list may consist of one or more DNS names or IP addresses (if DNS names are
used then you must append ,0x1 to the end of each DNS name). For example, to
synchronize the PDC Emulator in your forest root domain with
tock.usno.navy.mil, an open-access SNTP time server run by the United States
Naval Observatory, change the value of the NtpServer registry entry from
time.windows.com,0x1 to tock.usno.navy.mil,0x1 here. Alternatively, you can
specify the IP address of this time server, which is 192.5.41.209 instead.

Now stop and restart the Windows Time service using the following commands:

net stop w32time

net start w32time

It may take an hour or so for the PDC Emulator to fully synchronize with the
external time server because of the nature of the polling method W32Time
uses. Depending on the latency of your Internet connection, the accuracy of
the CMOS clock on your forest root PDC Emulator may be within a second or
two of UTC. If you need more accurate time however, you can purchase a
hardware time source like an atomic clock and connect it to your PDC
emulator.

Alternatively, if you don.t want to wait for time convergence to occur
between your stratum 2 time server (your forest root PDC Emulator) and the
external stratum 1 time server, you can run the following command on your
PDC Emulator:

w32tm /resync /rediscover

Tip
There are additional registry settings you can configure to ensure external
time synchronization operates effectively, see this article in the Microsoft
Knowledge Base for details.

http://support.microsoft.com/kb/816042

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