I have a home server running Kubuntu 14.04. It serves a web page to the outside world and provides internet access to all devices on my home LAN. I have an Arduino device with a web server application for reporting temperature. I wish to use my Android phone to connect to the Arduino web page.
I use UFW for configuring my firewall and wish to forward requests to my home server using port 225 to the Arduino web page, configured to listen to port 225.
I can reach the Arduino from anywhere on my home LAN, but not from the outside. I've researched and tried many things but am unsuccessful. Sites like "check your ports" report back that port 225 is closed.
Any help is greatly appreciated!