I have run into an issue that I cannot resolve. I have an Arduino with Ethernet shield. This device is setup as a web server. I also have a windows server 2008 R2 server with IIS running. On the IIS server runs a PHP application, this page will collect data from the Arduino, which is returned as a JSON formatted string. This all works fine, except when access from the internet. So :-
- When accessing the IIS website from the local LAN, everything works perfect.
- When accessing the IIS website from the internet, IIS does not even make a call to the Arduino (nothing shows in the serial monitor).
Has anybody any ideas?? I know the issue must be in IIS somewhere.