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Linux "Address Already in Use" — Port Conflict Fix

Warninglinux network

Overview

Fix "Address already in use" or "EADDRINUSE" error. Another process is using the port.

Key Details

  • Error: Address already in use (EADDRINUSE)
  • Category: Linux Network Error
  • Port is occupied by another process
  • Service cannot start on desired port

Common Causes

  • Another instance of the service is running
  • Previous process did not release the port
  • Different service using the same port
  • TIME_WAIT state holding the port

Steps

  1. 1Find what is using the port: sudo lsof -i :PORT
  2. 2or: sudo ss -tlnp | grep PORT
  3. 3Kill the process: sudo kill PID
  4. 4Use SO_REUSEADDR in code for TIME_WAIT
  5. 5Change to a different port if needed

Tags

linuxlinux-networklinux port already in useubuntuterminal

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Frequently Asked Questions

Typically 60 seconds. Use SO_REUSEADDR to bind immediately.