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Port Configuration - Factorio Guide

Factorio Guide • Updated Feb 10, 2026

Port Configuration for Factorio

Proper port configuration is essential for players to connect to your Factorio server. This guide covers the network requirements and how to open your server to the world.

Default Port

Factorio uses UDP 34197 by default. Unlike many other games, Factorio does not use TCP for game traffic.

Protocol

Ensure you select UDP when creating rules. Opening TCP 34197 will not allow players to join.

Scalability

If running multiple servers on one IP, increment the port for each instance (e.g., 34198, 34199).

Changing the Server Port

You can change the port in your server-settings.json file:

{
  "port": 34197
}

Remember to update your firewall and router rules if you change this value.

Firewall Configuration

Linux (UFW)

For most Linux distributions like Ubuntu or Debian:

sudo ufw allow 34197/udp
sudo ufw reload

Linux (firewalld)

For CentOS or RHEL-based systems:

sudo firewall-cmd --permanent --add-port=34197/udp
sudo firewall-cmd --reload

Windows Firewall

  1. Search for "Windows Defender Firewall with Advanced Security".
  2. Select Inbound Rules -> New Rule.
  3. Select Port -> UDP -> Specific local ports: 34197.
  4. Select Allow the connection and ensure all profiles (Domain, Private, Public) are checked.

Router Port Forwarding

If hosting from home, you must forward the port from your router to your server's local IP:

  1. Access your router's admin panel (usually 192.168.1.1).
  2. Find the Port Forwarding or NAT section.
  3. Map External Port 34197 to Internal Port 34197.
  4. Set Protocol to UDP.
  5. Enter your server's internal/static IP address.

Troubleshooting

  • Couldn't establish network communication: Usually means the UDP port is blocked by a firewall or not forwarded.
  • Port already in use: Another process (or a previous instance of Factorio) is using 34197. Check for zombie processes.
  • ISP Restrictions: Some ISPs block common game ports. If 34197 fails, try a high-numbered port like 54197.

Security Tip: Only open the specific UDP ports required for your game. Avoid using "DMZ" mode on your router as it exposes your entire machine to the internet.

Bridge the connection. View plans.

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