Port 8080: alternate HTTP port

Port 8080 is the most common alternate HTTP port for backends, proxies and containers.

Port: 8080
Protocol: TCP
Service: HTTP alternate
Exposure: Public: usually no, behind a reverse proxy

daniele@mikweb: ~/ports — less 8080.md

Port 8080 is registered with IANA as http-alt. Typical users: Tomcat, Jenkins, web proxies, dev servers and container backends behind a reverse proxy like nginx or Caddy.

Usually not public: bind the backend to 127.0.0.1 and expose only the reverse proxy on 443. Docker trap: -p 8080:80 bypasses UFW/firewalld because Docker inserts its own iptables rules. Use -p 127.0.0.1:8080:80.

Typical: Address already in use when several services claim 8080, and redirects to :8080 in absolute URLs when the proxy doesn't pass the Host header correctly.

Check

curl -I http://example.com:8080