Ntp not updating system time
The 36 routers can sync to public NTP servers on the internet but cannot sync to my internal NTP server.
The routers do have access to the NTP server because they and ping and traceroute to it.
The old parable about the man with one clock knowing what time it is but the man with two never being sure...
One server is an obvious "truechimer" always because there's nothing to invalidate it.
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I now have a total of 5 servers in set multiple via the System Preferences GUI: just type server names into the field with commas to separate them. BTW #2: here's the site I got the list of publicly accessible NTP servers from.