It is probably a problem with your Qlik Sense Server configuration.
Common problems are :
- "websocket white list", where you should add your domain (example: mydomain.com) or ip-adress of the .Net SDK clients.
- firewall ports
Please read the manual and verify your configuration .
I added my local hostname to the Websocket origin white list. The firewall is and was off. Did changed anything.
What is the service (URI) to connect with the QlikSense.NetSDK?
I tried every port:
As far as I can tell the documentation didn't say.