Let's assume you followed the setup instructions in the documentation and got DocFetcher Server up and running to the point where you can access it locally, i.e., on the server machine, via a URL like this: http://localhost:31190/ However, when you try to access it from the outside using your server machine's address, e.g., http://192.255.234.105:31190/, your browser only displays an error message. Possible explanations: If your server machine sits in a local network and connects to the outside world through a router, you need to set up port forwarding on the router. Access to the DocFetcher Server instance may be blocked by a firewall. It could be a firewall in your router, a firewall of your web hoster, or a firewall on the server machine itself (e.g., Windows Firewall, UFW).