Hello,
Its noted on the codesys help here:
https://content.helpme-codesys.com/en/CODESYS%20Development%20System/_cds_tutorial_refrigerator_conn...
However, as they state:
Controllers must never under any circumstances be accessible from the Internet or from untrusted networks. In particular, the programming ports of the controller must never be accessible from the Internet without security protection
So a VPN is the way to go, and then you only need to forward the VPN ports (Port 443 for IXON)
If you dont want a VPN and still want to update the program remotly (wont be able to login and debug the application) is to program it on a local device, and then upload a appdata archive to the remote core, but in this case you want the firewall app to block everything else.
