While anyone can configure a development server to run on port 11501, the phrase is heavily associated with specific use cases:
Open your terminal application and query active network files using the lsof tool: sudo lsof -i :11501 Use code with caution.
Developers building custom reverse proxies or load balancers often use 11501 as the entry point to test how traffic is routed to various "downstream" services. Technical Setup: How to Configure 11501
sudo ss -tulpn | grep :11501
The number at the far right of the output line is the PID. To terminate that specific process, run: taskkill /PID /F Use code with caution. Best Practices for Managing Custom Localhost Ports