Centrify not using ntp server

I'm testing Centrify Express for Linux (CentOS 7) and it's refusing to acknowledge my working ntp server. From an ssh session on my testing box:

sudo ntpdate -q hubcap
server 192.168.6.10, stratum 2, offset -0.004164, delay 0.02596
 5 Jan 16:11:08 ntpdate[5219]: adjust time server 192.168.6.10 offset -0.004164 sec

Hubcap is the DC for this domain. But when I analyze with Centrify, I get "We re-queried hubcap.ad.goldblattsystems.com for the time, and it did not answer." 

How can I get this working?