Hi @crumbag,
28252 is the only port that spacedesk used.
Could you please check if your current network profile in your primary machine is Private or Public?
Could you also try to connect with HTML5 Viewer on your iPad too, just open a web browser (e.g. Safari or Google Chrome) then go to http://viewer.spacedesk.net/, the try to connect to your computer’s IP address.
