how to host lan server

Halo 2 Project Cartographer Dedicated Server Setup Guide This method is automated using a tool that will simplify the installation process for Dedicated Servers. By default you may create 2 servers using this tool however more may be requested using the webform present on the page listed in...

So for like 2 months I've been trying to figure out how to host a game and have my brother join. I really wanna play coop campaign with him and i found this tool on this page: https://halo2.online/threads/coop-mode-update.468/ So now I'm trying to host a server but every time I do i get this...