You need to be able to connect from the machine you are running the samples to the converter server's machine (192.168.80.5) on port 443. You can check the following;
* Converter Server is running
* There is no firewall blocking port 443
* There is no other application holding port 443 and not allowing Converter to listen on it (a web server on the same machine?)
* Converter server is installed in Client-Server mode (by default it is installed in local-only mode and no TCP connections are allowed, but SDK samples support only TCP mode).