time server question

I am getting the error "the ntp server didn't respond" in the system event log on my domain controller.  This just started happening.  Previously I was using tick.usno.navy.mil and tock.usno.navy.mil as my server and I never recieved this error.  After the error started I pinged them and noticed they were not available.  So I changed my sntp server too now.okstate.edu which responds too pings.  I did this last night and I am still getting the same error though.

I have been using the net time commands too perform this on my domain controller.  I read a few articles on the use of net time and w32time on the internet and I can't see any reason why this error is occurring.

Anyone have any ideas?
donnatroniousAsked:
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adonis1976Commented:
did you set the sntp on the same machine as you did before? and one more thing note is only the domain controller that holds the PDC FSMO(Flexible Single Master Operation) role can query an external time source to set the time.

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Windows 2000

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