Time issues

In our Domain, we are receiving issues with the time service on all our
servers. The time service is working correctly (Event ID: 35), when we
receive Event ID: 38, then 20 minutes later we receive Event ID 24 and Event
ID 29. Then 24 hours later we receive Event ID 36, and then 12 hours we
receive Event ID 29. (See Events below) The only way to fix this is to stop
and start the time service, which is not practical on 200 domain controllers.
We have tried a couple options with the time service. The latest was to run
“w32tm /unregister� and “w32tm /register�, to bring the time service back to
the defaults.
We have also tried “w32tm /config /update
/manualpeerlist:"DomainSRV1.internal.testdomain.com " /syncfromflags:MANUAL
/reliable:YES� and “w32tm /config /syncfromflags:domhier /update�
The PDCEmulator is configured to an external time source which is working
correct.

Event Type: Error
Event Source: W32Time
Event Category: None
Event ID: 29
Date: 3/06/2009
Time: 8:01:10 AM
User: N/A
Computer: S2400
Description:
The time provider NtpClient is configured to acquire time from one or more
time sources, however none of the sources are currently accessible. No
attempt to contact a source will be made for 15 minutes. NtpClient has no
source of accurate time.

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.


Event Type: Warning
Event Source: W32Time
Event Category: None
Event ID: 36
Date: 3/06/2009
Time: 12:42:12 AM
User: N/A
Computer: S2400
Description:
The time service has not synchronized the system time for 86400 seconds
because none of the time service providers provided a usable time stamp. The
time service is no longer synchronized and cannot provide the time to other
clients or update the system clock. Monitor the system events displayed in
the Event Viewer to make sure that a more serious problem does not exist.

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.

Event Type: Error
Event Source: W32Time
Event Category: None
Event ID: 29
Date: 2/06/2009
Time: 1:49:45 AM
User: N/A
Computer: S2400
Description:
The time provider NtpClient is configured to acquire time from one or more
time sources, however none of the sources are currently accessible. No
attempt to contact a source will be made for 15 minutes. NtpClient has no
source of accurate time.

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.

Event Type: Warning
Event Source: W32Time
Event Category: None
Event ID: 24
Date: 2/06/2009
Time: 1:49:45 AM
User: N/A
Computer: S2400
Description:
Time Provider NtpClient: No valid response has been received from domain
controller greensaw.internal.bunnings.com.au after 8 attempts to contact it.
This domain controller will be discarded as a time source and NtpClient will
attempt to discover a new domain controller from which to synchronize.

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.


Event Type: Information
Event Source: W32Time
Event Category: None
Event ID: 38
Date: 2/06/2009
Time: 1:33:13 AM
User: N/A
Computer: S2400
Description:
The time provider NtpClient cannot reach or is currently receiving invalid
time data from greensaw.internal.bunnings.com.au
(ntp.d|172.17.53.188:123->172.16.7.11:123).

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.


Event Type: Information
Event Source: W32Time
Event Category: None
Event ID: 35
Date: 21/05/2009
Time: 3:13:57 PM
User: N/A
Computer: S2400
Description:
The time service is now synchronizing the system time with the time source
greensaw.internal.bunnings.com.au (ntp.d|172.17.53.188:123->172.16.7.11:123).

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.