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detecting-port-conflicts

Diagnose port conflicts and resolve EADDRINUSE errors by identifying the occupying process.

2|Updated Apr 3, 2026
Search Tags:#diagnose#detect#port-conflicts#lsof#eaddrinuse#port-change
One-click install
npx skills add https://github.com/kscius/KS-Cursor-Orchestrator --skill detecting-port-conflicts
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: detecting-port-conflicts
Source: https://github.com/kscius/KS-Cursor-Orchestrator/tree/main/skills/detecting-port-conflicts
Command: npx skills add https://github.com/kscius/KS-Cursor-Orchestrator --skill detecting-port-conflicts

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Detects when a port is already in use and provides steps to identify the occupying process and free or allocate the port.

Core Features & Use Cases

  • Detection of port-conflict indicators such as EADDRINUSE and address already in use messages.
  • Diagnosis by listing the occupying process and its PID, enabling targeted remediation.
  • Resolution options including killing the blocking process or selecting an alternate port for development servers.
  • Use Case: when a dev server fails to bind to a port, this skill guides you to resolve it quickly.

Quick Start

Invoke this skill when you encounter a port already in use error to identify the occupying process and free the port.

Frequently Asked Questions about detecting-port-conflicts

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I fix an EADDRINUSE error when my dev server fails to bind to a port?▼

To fix an EADDRINUSE error, you must identify the occupying process using its PID and then terminate that process or select an alternate port for your development server to free the port contention.

What is the best way to diagnose port conflicts in a local development environment?▼

The best way to diagnose port conflicts is by detecting address already in use messages and inspecting the occupying process with commands like lsof to list the PID for targeted remediation.

How do I find and kill the process using a specific port?▼

You can find and kill the process using a specific port by running inspection commands to list the PID of the occupying process, then terminating that process to resolve the port contention.

Can I use this approach to resolve port conflicts inside container environments?▼

Yes, this approach applies to container environments and local development servers, resolving any service that fails to bind due to port contention by identifying the occupying process.

What should I do if killing the blocking process is not an option?▼

If killing the blocking process is not an option, you can resolve the port conflict by selecting an alternate port for your development server to reallocate the binding target.

Why does my service fail to bind with an address already in use message?▼

Your service fails to bind with an address already in use message because another process is currently occupying the target port, creating a port conflict that prevents successful binding.

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