Localhost11501

Cause: No service is listening on port 11501, or the service crashed.
Fix:

"Timeout" or slow responses

"Certificate/security errors" (HTTPS)

Service reachable from other machines?

Port already in use

Reverse proxy: route a path from another local server (e.g., nginx) to localhost:11501.

Cause: No service is listening on port 11501, or a firewall is blocking it. localhost11501

Solutions:

sudo lsof -i :11501

netstat -tulpn | grep :11501

This shows the process name and PID.