Seeking help / insight in FMS19 install

[Richmilnix]

I’m looking for insight / input regarding an at-home install of FMS 19. Because I’m mystified and can’t figure out what the problem is, I’m writing an everything-but-the-kitchen-sink in hopes that someone might recognize something. To that end, I’m including real local IP addresses (to try and avoid confusion).

I’m enrolled in the Claris Developer program that allows me to install FMS and have up to three clients. I’ve installed FMS on two machines: a Win10 box that’s a regular presence on my LAN (hosts UniFi and Subsonic) and a Mac Mini running 10.15.6. (My life is simpler if I can get it running on the Windows machine but Win10 isn’t approved for FMS.)

I’ve been getting identical results on the two machines, but I have to choose something to write about, so I’m writing about the Mac, running Safari 13.1.2.

Everything is as expected at [ http://127.0.0.1:16001 ], at [  computername.local  ] and at [  http://localhost:16001  ]. GUI looks good, and I can access hosted databases from iOS devices and FMP client on laptops on local Wi-Fi.

At [  http://192.168.1.174:16000  ], the only content I get in Safari is ‘Not Found.’ (I’m going to point out here that this isn’t the same message I get when Safari can’t connect to a server.)

Other things that are true, in case they’re pertinent:

Mac OS Firewall is currently off.

GUI at 127.x reports that WebDirect is enabled at [  http://127.0.0.1/fmi/webd  ], but that page reports this error:

The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.

Thanks in advance for any input.

update / correction / oversight:

re-uploaded OpenJDK; WebDirect now functional in-browser via localhost, but still no results at [  192.168.1.174:16000  ].

just FYI, loading [  http://192.168.1.174/  ] (no port suffix) does reveal H1 text FileMaker Database Server Website and round 'T' logo.

[Ocean West]

https://support.claris.com/s/answerview?language=en_US&anum=000035242