w32Time errors

Hi.

SBS 2003, R2.

I am recieving alot of W32Time errors and was thinking of changing the sources, it currently is using time.windows.com.

I am in the UK so, ideally would need a time source within the uk i persume.

Could you;
1. show me how to change the time sources on sbs 2003
2. give me reliable time sources.

thanks
imamdaniAsked:
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imamdaniAuthor Commented:
Errors;

Event Type:      Error
Event Source:      W32Time
Event Category:      None
Event ID:      29
Date:            25/04/2010
Time:            20:59:56
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 960 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:      47
Date:            25/04/2010
Time:            20:59:56
Time Provider NtpClient: No valid response has been received from  manually configured peer time.windows.com,0x1 after 8 attempts to contact it. This peer will be discarded as a time source and NtpClient will attempt to discover a new peer  with this DNS name.  
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:            25/04/2010
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 960 minutes. NtpClient has no source of accurate time.
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
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Brian PiercePhotographerCommented:
1st make sure port 123 is open (NTP)
If you really need to change the NTP server see http://support.microsoft.com/default.aspx/kb/816042?p=1
There is a list of time servers at http://www.timetools.co.uk/ntp-servers/ref/ntp-servers-uk.htm
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imamdaniAuthor Commented:
KCTS,

I am fairly new to SBS, how would i check if post 123 is open?

Thanks
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Brian PiercePhotographerCommented:
How are you conneting to the internet - are you using ISA server or an external firewall ?
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Brian PiercePhotographerCommented:
...
Assuming it ISA... open the ISA management console and go to Firewall Policy and right click the SBS Local Host Access Rule in the right pane. Select  Properties. On the Protocols tab to make sure NTP (UDP) is added.  
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imamdaniAuthor Commented:
Sorry KTCS, something urgent came up and i couldnt go back to resolving this issue. I will let you know once I've done that.

Thanks
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imamdaniAuthor Commented:
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