Once you have a service listening on port 11501, connecting is straightforward. Simply open your web browser and enter:
Set the PORT environment variable before starting:
If a previous instance of your development tool crashed, it might be hanging onto the port secretly, blocking a new connection. Find the from the commands above, then kill it: Windows : taskkill /PID /F macOS / Linux : kill -9 3. Inspect Local Firewall Interferences localhost-11501
Look for a log line in your terminal that says something like: Server running at http://localhost:11501 or Listening on port 11501 . Ensure you are using that exact number in your browser's address bar.
Another application on your system might have "beaten you to it" and is already using port 11501. The lsof or netstat command from Step 1 will tell you the of the process using the port. You can then check what that process is. If it’s not the service you intend to run, you have a conflict. You can either terminate the conflicting process or reconfigure your desired service to use a different port. Once you have a service listening on port
The hostname localhost is a reserved network name used to refer to the current computer used by the user. When a browser or application attempts to connect to localhost , the request is looped back to the computer's own network interface, bypassing the external network infrastructure. This creates a secure, closed environment for testing and inter-process communication.
Sometimes, when an application crashes, it doesn't immediately release its port. Waiting a few moments or restarting your computer can resolve this. Inspect Local Firewall Interferences Look for a log
Step-by-Step Troubleshooting for "Connection Refused" Errors
localhost:11501 is a local address typical of a specialized, custom, or debugging service running on your machine. It is not a standard port, so it often signifies a purposeful development tool or an internal application interacting with your network interface.
Since port 11501 is typically used only for local development and is not exposed to the public internet via your router, it is generally considered safe. However, if you are using a framework like Vite or Webpack, be aware of their default host settings. If your development server is configured with host: '0.0.0.0' , it will listen on all network interfaces, making it accessible to other devices on your local network and potentially creating a security risk.
as its default connection port for communicating with smart home controllers. CarMaker-ROS Interface : In automotive simulation environments, port is often used as a service connection for (a visualization tool) within the CarMaker-ROS interface. Custom Microservices