W32TM not syncing to external time source - event id 50 - source W32TM -

I'm getting the below warning in my event log.  I'm using the host 'time.uh.edu' as an external time source.  I was using a different time server previously but I was receiving this error so I then started to use 'time.uh.edu' instead.  Now I'm getting this error when using this time source.  I'm running Windows 2003 server with sp1.  It's a DC and an Exchange server.  What do I need to change?

Event Type:      Warning
Event Source:      W32Time
Event Category:      None
Event ID:      50
Date:            4/21/2006
Time:            4:57:02 AM
User:            N/A
Computer:      DREXEL_3
The time service detected a time difference of greater than 128 milliseconds  for 90 seconds. The time difference might be caused by synchronization with  low-accuracy time sources or by suboptimal network conditions. The time service is no longer synchronized and cannot provide the time to other clients or update  the system clock. When a valid time stamp is received from a time service  provider, the time service will correct itself.  

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Who is Participating?
Hi gopher_49,

Have you reviewd http://support.microsoft.com/default.aspx?scid=kb;en-us;830092?  The actual hotfix is posted here - http://www.adminnotes.com/hotfix/2004/04/830092.zip


Actually, this hotfix was supposedly included in SP1.  I would check the file version and reapply if necessary.  Something may have replaced the w23time.dll to its pre-SP1 state
gopher_49Author Commented:
I changed my W32tm source server and it works.  I made it reference a different external server and it's working perfectly.

gopher_49Author Commented:
The error came back, however, I re-started the W32TM service and it's sync'ed up again.
gopher_49Author Commented:
Do I need to open any ports on my firewall?  I would think that due to me making the request for the time sync via UDP protocol the firewall would allow the traffic upon request.
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