WebSockets TLS ERR_CONNECTION_RESET

I have a WPF application running as "Server" that sends data to the browser via WebSockets "Server" sends this data over the top http://localhost:8181

to my site successfully.

The problem is that I recently updated my site to be accessible over HTTPS, but now all requests to websites are being blocked because it is not secure. ws://localhost:8181.

I changed the server to send data via TLS ( https://localhost:8443

) and my site to receive sockets via wss: // localhost: 8443.

But now I always get the following error:

WebSocket connection with 'wss: // localhost: 8443 / MyData / stream' failed: error establishing connection: net :: ERR_CONNECTION_RESET

Access-Control-Allow-Origin is set to *

What am I doing wrong here?