A fresh replacement ERX, first configured with 1.7.1, then updated to 1.9.0.
Looks like ntp.conf is not updated/handled properly.
Jan 1 00:00:44 erx ntpd[936]: ntpd 4.2.6p2@1.2194-o Fri Jul 29 23:29:52 UTC 2016 (1) Jan 1 00:00:44 erx ntpd[937]: proto: precision = 44.861 usec Jan 1 00:00:44 erx ntpd[937]: line 25 column 28 syntax error, unexpected T_String, expecting T_EOC Jan 1 00:00:44 erx ntpd[937]: syntax error in /etc/ntp.conf line 25, column 28 ubnt@erx:~$ sed -n 25p /etc/ntp.conf server pool.ntp.org iburst dynamic
Probably the 'dynamic' keyword is not valid anymore, at least its not in ntp.conf on my workstation
After some search I found its part of my config:
set system ntp server pool.ntp.org dynamic
Not sure if that was in any releasenote for 1.8 or 1.9.