Hey there,
since a few months I have a problem. My D735 is getting any ntp server. The D785 is working properly. 

The logs just show:

Aug 14 11:44:25.803 [ERROR ] PHN: Ntp failure

The settings are as following (same on D735 and D785 - only D785 work):

Could you please resolve this issue?

Kind regards,
Lars