Question

A web application on a Linux server is reachable from the server itself using curl http://localhost:8080, but remote clients on the LAN receive 'connection refused' when connecting to the server's LAN IP on port 8080. Firewall rules have been confirmed to allow the port. Which command output would BEST confirm the root cause of this behavior?

Accepted Answer

ss -tlnp | grep :8080 showing the socket bound to 127.0.0.1:8080

Answer

ping showing the LAN gateway is reachable from the server

Answer

dig +short of the server hostname returning the correct LAN IP

Answer

traceroute from a client showing zero hops of packet loss to the server