cRIO Only Shows PTP_LISTENING When Syncing to PTP Master Clock

Updated Apr 12, 2018

Reported In


  • cRIO-9035


  • NI-TimeSync 17.5
  • NI-TimeSync

Issue Details

I've installed the latest TimeSync driver on my compatible cRIO, but when I try to sync it to a PTP master clock as a slave, it only shows PTP listening and doesn't seem to be syncing properly. How can I solve this?


This problem is often due to hardware/networking incompatibilities. Try the following things:
  • Ensure that the devices are on the same subnet. If the devices are on separate subnets, the cRIO may simply be unable to see the master.
  • Connect the devices on the same physical switch. Many network switches are not PTP capable.
  • Try a direct connection. If a direction still does not work then, the issue is likely due to a incorrect value in your settings.


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