How do I kill the process using port 8080?

On macOS & Linux, run: "kill -9 $(lsof -t -i:8080)". On Windows PowerShell (as Admin), run: "Stop-Process -Id (Get-NetTCPConnection -LocalPort 8080).OwningProcess -Force".

Why am I getting "port 8080 already in use" (EADDRINUSE)?

This occurs when another background instance of java, node, jenkins or a zombie process is already bound to port 8080. Use the kill commands above to free the port immediately.

Web & Dev

Risk: Medium

Port 8080 — HTTP Alternate / Tomcat / Spring Boot / Vue CLI

Q: Is Port 8080 safe to expose to the public internet?

Risk level is Medium. Frequently targeted by automated scanners looking for exposed Tomcat management dashboards, Jenkins instances, or proxy misconfigurations.

Port 8080 is the standard HTTP alternate port used by Apache Tomcat, Spring Boot, Vue CLI, Jenkins, and proxy services. It provides unprivileged HTTP serving without requiring root/admin access.

PORT NUMBER

8080

PROTOCOL

TCP

DEFAULT PROCESS

java, node, jenkins

FIREWALL TARGET

8080/tcp

Instant Terminal Fixes for Port 8080

macOS & Linux Terminal

1. Check who is listening on port 8080:

lsof -i :8080 || ss -tulpn | grep 8080

2. Kill process occupying port 8080 (EADDRINUSE fix):

kill -9 $(lsof -t -i:8080)

3. UFW Firewall Allow rule:

sudo ufw allow 8080/tcp

Windows PowerShell (Admin)

1. Check listening port:

Get-NetTCPConnection -LocalPort 8080

2. Force kill process on port 8080:

Stop-Process -Id (Get-NetTCPConnection -LocalPort 8080).OwningProcess -Force

3. Docker Port Forwarding Mapping:

docker run -p 8080:8080 -d my-spring-app

Common Error Encountered

Web server failed to start. Port 8080 was already in use.

Security Advisory & Hardening

Frequently targeted by automated scanners looking for exposed Tomcat management dashboards, Jenkins instances, or proxy misconfigurations.

Frequently Asked Questions

Port 8080 Questions & Answers

Common questions regarding default services, kill commands, and firewall configurations.

Port 8080 is commonly used for HTTP Alternate / Tomcat / Spring Boot / Vue CLI. Port 8080 is the standard HTTP alternate port used by Apache Tomcat, Spring Boot, Vue CLI, Jenkins, and proxy services. It provides unprivileged HTTP serving without requiring root/admin access.

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