You need to add our IP address, told in the instructions and shown in our Tutorial Video
, to your API settings in your Xtream UI panel.
Please keep in mind, that you have to use the IP address and port number of your Server/API, not of your Panel!
Please make sure that you are not behind a Firewall, Proxy, Cloudflare or similar.
Please turn off the integrated firewall of Xtream UI as well.