If you could provide more context about what you're trying to accomplish or what you're seeing, I could give you a more tailored response.
Only one application can use port 11501 at a time. To see if another program is blocking it: http //localhost 11501
Developers use high-numbered ports like 11501 to host internal APIs, microservices, or browser extension backends away from standard traffic. Troubleshooting "Connection Refused" If you could provide more context about what