If these tools return blank results, your application server is simply not running, or it is crashing silently on boot. Step 2: Handle Port Conflicts
Run a microservices environment on your laptop:
This is the standard hostname given to the address of the local computer. It allows a device to connect to its own network services without needing a physical network interface or an internet connection. localhost11501
localhost is a DNS alias for 127.0.0.1 (IPv4). Both are functionally identical.
[ Protocol ] [ Hostname / IP ] [ Custom Port ] http:// localhost : 11501 (127.0.0.1) The Role of Localhost If these tools return blank results, your application
If you are a developer configuring a service on port 11501, ensure your code binds explicitly to 127.0.0.1 and not to 0.0.0.0 . Binding to 0.0.0.0 instructs the application to listen to all network interfaces, exposing port 11501 to the outside network and opening up potential remote vulnerabilities.
If you are trying to load localhost:11501 and receive a or "Site Can't Be Reached" error, use the following systematic checklist to diagnose the failure. 1. Verify Active Services localhost is a DNS alias for 127
Some older versions of development tools or specific local proxy servers (like those used for bypassing CORS during frontend development) default to the 11xxx range. Troubleshooting "Connection Refused" at Localhost:11501
A port is a virtual endpoint for network communication. Think of your computer as an apartment building: localhost is the address of the building, and port 11501 is a specific apartment number. Different applications use different ports to avoid conflicts.
socat TCP-LISTEN:11501,fork TCP:localhost:11502
Using localhost and a high port number like 11501 for services: