I have a wood pellet boiler that is connected via ethernet cable to my home router. I can access the boiler to perform various functions whilst on the local LAN but not externally. There is no way to password protect this page so I didn't want to forward the ports and make it available for everyone. The internal IP address of this is 192.168.1.194To get around this I bought a raspberry pi and installed Apache on it. The IP address of this is 192.168.1.168. I created a simple password protected webpage with the link to the boiler IP address and port forwarded this.I can access the Apache web server when internally on the LAN and use the boiler control page, however I can't get the boiler control page to display when accessing the webssever from an external IP. I can access the webssever externally but when I click on the boiler link it tells me that it cannot be found.I can also successfully ping the boiler IP address from the raspberry pi.Is there something I am missing ?