ポート 8080 — HTTP-Alt (TCP)
What is Port 8080?
一般的な代替HTTPポート
This is a registered port (1024–49151) often assigned to vendor or application services like HTTP-Alt. · No dedicated RFC; follows HTTP (RFC 9110)
When do you need Port 8080 open?
Open if an application server (Tomcat, Jetty, or a dev server) must be reachable externally. For production, consider proxying through Nginx or Apache on port 80/443 instead of exposing port 8080 directly.
Common uses and software
- Apache Tomcat
- Jetty
- Jenkins CI/CD
- Squid Proxy
- Nginx (reverse proxy setup)
- Spring Boot (dev default)
- Docker container HTTP
Security
Port 8080 often runs development or admin-grade services that may lack production hardening. If serving public traffic, configure a reverse proxy (Nginx or Caddy) to terminate HTTPS on port 443 and proxy to 8080 internally. Do not expose raw port 8080 to the internet in production. Ensure the application behind port 8080 requires authentication for sensitive endpoints.
Is Port 8080 safe?
An open port increases your attack surface. Safety depends on how HTTP-Alt is configured.
Low risk, but confirm that HTTP-Alt on this port is intentionally running and required by your application before leaving it open.
Test connectivity for Port 8080 on any host.
How to Open Port 8080
To allow incoming connections to Port 8080 (HTTP-Alt) from outside your network, configure your firewall and add a port forwarding rule on your router pointing to your device's local IP address.
Open Windows Defender Firewall → Advanced Settings → Inbound Rules → New Rule → Port → TCP → Specific local ports: 8080 → Allow the connection → Name and save the rule.
netsh advfirewall firewall add rule name="Open Port 8080" dir=in action=allow protocol=tcp localport=8080sudo ufw allow 8080/tcpsudo iptables -A INPUT -p tcp --dport 8080 -j ACCEPTLog into your router (192.168.1.1 or 192.168.0.1) → Port Forwarding → Add a new rule: Protocol TCP, External port 8080, Internal IP: your device's local IP, Internal port 8080 → Save.
How to close Port 8080
If you do not need HTTP-Alt, block this port in your firewall or router.
To block port 8080 on Windows, run the following command in PowerShell or Command Prompt (as Administrator):
netsh advfirewall firewall add rule name="Block Port 8080" dir=in action=block protocol=tcp localport=8080sudo ufw deny 8080/tcpsudo iptables -A INPUT -p tcp --dport 8080 -j DROPRemove or disable any port forwarding rule for Port 8080.
Frequently Asked Questions
What is Port 8080 used for?▾
Port 8080 is the default TCP port for HTTP-Alt. It is used by servers and applications that need to accept incoming connections for this service. Whether you need it open depends on whether you are actively running a HTTP-Alt server — if not, it should remain closed to reduce your attack surface.
Is Port 8080 safe to keep open?▾
An open Port 8080 increases your attack surface. If you are not actively running HTTP-Alt, close this port in your firewall and remove any port forwarding rules. If HTTP-Alt must be accessible, restrict access to known IP ranges, keep the service software updated with security patches, and use strong authentication.