Unable to access web server from separate device?

I recently setup Apache on an old iMac (2006 running 10.4) I had sitting around collecting dust.

Localhost worked great, I uploaded my own html files and they displayed. HOWEVER, when I try and access the web page from my Ubuntu laptop I get a connection error (typing in my ip address).

I tried from my laptop that is connected to the same network, and I tried from my iPhone pulling from the LTE network.

Security software installed on the Mac preventing remote connections, perhaps a firewall.

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