Opera Mini IP address handling

Hi, I've successfully installed Opera Mini on both my Android device and Wearable (Samsung Gear S). Surfing works fine, however it seems I cannot access local hosted web pages by entering the IP address and port number. (example: http://1.2.3.4:1234)

Opera for Android can reach the service and successfully loads the HTML page (AJAX client) but not the Mini version. Any ideas why it won't load or what I can do?

Thanks :)