How to troubleshoot localhost ports

localhost issues are often bind-address issues.

• App bound to 127.0.0.1 will not accept LAN clients
• App bound to 0.0.0.0 may still fail app-layer HTTP
• IPv6 ::1 vs IPv4 127.0.0.1 surprises browsers

PortPilot shows the actual bind. Diagnose runs loopback HTTP checks and will say Unknown rather than inventing internet reachability.

1. portpilot port <n> or desktop port detail
2. Confirm process still alive
3. Run Diagnose
4. Kill/restart the owner if it is a ghost listener

Related: Diagnostics, Port conflicts.