Firewall doesn't affect 127.0.0.1:8080 as that is only the same computer. No remote can access that, only programs on the same computer as Calibre.
You need the LAN (WiFi or Ethernet) IP address, which is often something like 192.168.0.73 (could be anything NOT 127.0.0.1, which is internal loop back).
Or the network name of the computer may work.
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To find your Mac's current internal IP address, run: ifconfig -l | xargs -n1 ipconfig getifaddr This is basically equivalent to ipconfig getifaddr en0 , but more reliable!
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apple stack exchange
see also
https://www.howtouselinux.com/post/c...address-on-mac