In order to host a drafting session, your network configuration needs to allow users to connect to your server.
The drafting server will attempt to use UPnP to automatically map a port on your router. This will allow other players to communicate with your server without any additional setup required.
If UPnP is not available, it is possible to specify a port for the drafting server and manually configure your router to port-forward that port. Port-forwarding is different for every router, and is only recommended for advanced users. Currently the external port needs to be the same as the internal port. In the future, there may be an option within NautDrafter to define the external port as well as the internal port so that the external port will not need to be the same as the internal port.