On Thu, Apr 01, 2021 at 09:15:38PM -0400, Hussamuddin Nasir via Linuxptp-users 
wrote:
> Hello folks,
> 
>   I have a setup where we have a GM
> https://timemachinescorp.com/product/ptp-network-time-server-tm2000a/ and a
> linux client that works fine in the unicast setup we have. All is fine until
> the time server for some reason reboot. At that point the ptp4l daemon on
> the linux machine never sees the master clock even though its up and
> running.

The unicast client doesn't know that it must re-enable the
subscriptions.  You can mitigate by reducing the grant durations.

HTH,
Richard


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