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How to check if UDP port 123 is open? How to test this port?

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Last Modified: 2012-08-09
Time doesn't synchronize in my domain
If I type
-w32tm /resync /rediscover- the following error occur

Sending resync command to local computer...
The computer did not resync because no time data was available.

I think may be UDP port 123 is closed by some GP or other setting. I want to check if this port is open from my workstation to each of 3 domain controllers.

Thank you for help!
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