If you encounter an error like "Connection Refused" or "Localhost:11501 not found," it usually means one of three things:
While port numbers under 1024 are reserved for standard system services (like HTTP on port 80), higher numbers like 11501 are "user-defined" or "dynamic" ports. There are a few common scenarios where you might see this specific port in use: localhost-11501
To understand localhost-11501, you first have to understand the components. Localhost is the default name for the loopback network interface (IP address 127.0.0.1). It allows a computer to talk to itself. If you encounter an error like "Connection Refused"
Security Software: Certain antivirus or endpoint protection agents use local ports to communicate between the background service and the user interface on your screen. Troubleshooting Connection Issues localhost-11501