Localhost11501 Jun 2026

If you encounter localhost:11501 in your browser or logs, it likely means a program on your machine is listening for connections on that port. You can check which application is using it with commands like netstat -an | findstr 11501 (Windows) or lsof -i :11501 (macOS/Linux).

| Symptom | Likely cause | |---------|---------------| | Connection refused | No service listening on port 11501 | | Can’t access from another device | localhost is local only (use your LAN IP) | | Port already in use | Another program is using it (change the port or stop that program) | | Firewall blocking | Allow inbound/outbound on port 11501 | localhost11501

Arthur pulled the Ethernet cable from his tower. The internet should have died. Instead, the page refreshed instantly. If you encounter localhost:11501 in your browser or

Ensure that your software is configured to listen only on localhost (127.0.0.1) and not on "0.0.0.0" (which makes the port accessible to anyone on your local Wi-Fi network). Conclusion The internet should have died

It appears in error codes (like Error 11501 ) when the Symantec Management Server or Endpoint Protection Manager cannot connect to its database.

falls into the "Private" or "Dynamic" range. It isn't assigned to any universal service by default. Why use 11501?