Hello
I have the same issue.
I got my UPC Internet Box today and I setup all the port forwardings.
But the connection from my PC (internal IP) over the external DynDNS url to
my server (internal IP) doesn’t work. The DynDNS url is updated!
The same procedure works fine if I use my handy as a hotspot.
My PC has a external IP and can connect to my server with the DynDNS url.
Do you know the issue?
I have the feeling that the forwarding doesn’t work if you use different port number
by external to internal. Example: extern 1490 to intern 1433
Do you know an issue about that?