I have a NT 12.19 server app with three built in API Client procedures. These work as expected on my local machine, each API Client doing it's thing. I moved the app out to a test sever in Australia. This is a bare bones Windows Server 2019 Standard virtual server. The NT Server App runs fine and I can log into it from my browser. However, the API Clients don't seem to be connecting. All I get is a blank window, see the attached image.
I can ping the addresses and IP's that the API's target. I have ports 80 and 443 open in and out. I tried turning off the Windows firewall. Still, the API Clients don't work. Have I missed something?