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Where is the Minecraft server - on your network? Is one of the Macs acting as a server? Nothing to do with port forwarding or your Hub if everything is running on your LAN. Are your Mac firewalls disabled? (Check the firewall in Security under System Preferences).
Nothing to do with port forwarding, that is onlyrequired for external servers.
Both computers can't both have the same IP address, are you looking at the public IP address of your hub or their local private LAN addresses, they will be in the range 192.168.1.xxx
Hi Licquorice and thanks.
I have tried both LAN numbers both the Hub one (which the two computers share) and the IPv4 (which is unique to that computer). Neither were successful.
You need to use the IP address of the Mac running the server (e.g. 192.168.1.64) - don't use the Hub address. Is the server definitely running - there should be a terminal window on the Mac with the output from the Minecraft server - can you see this? Does it show any connection attempts? Are you using the default port for the server or has this been changed - it should be 25565 - look in the server config file. Also make sure the config file allows all users to connect.
The server is definetly running on the host computer, and yes that's the LAN number we have used predominatley used, the host computer's IPv4, the rest were in desperstion. Terminal windows doesnt sound very Mac. I know they can be opened but they don't open by default so no I can't see this, nor would I expect to. When you launch the game/server on the host mac, it puts up on screen a port number in game. At the moment I am not doing anything with this number nor do I know how to. This number isn't 22565. It varies when you launch the server. AN example of this numbe ris 52954 "Local game hosted on port 52954"
I didn't quite understand your last point. With in the application (Minecraft) you click open LAN which to my understanding allows that computer to be accessed by the other computer. I am not sure what else would need to be configured.
OK it sounds like you aren't running a dedicated Minecraft server but sharing the world on one of the Macs - so you just need to note the port number when you start sharing the world and then you append this to the IP address. So if you share the game on Mac with IP address 192.168.1.64 and port 52954 you just enter 192.168.1.64:52954 as the Minecraft server address on the other Mac and it should join the game.