Should I open TCP, UDP or both?

The one the game uses: see the ports checker. Without a protocol the tool generates both TCP and UDP, which opens more than needed: specify the protocol when you know it.

Do the rules survive a reboot?

ufw and Windows do. For iptables, install iptables-persistent and run netfilter-persistent save; for nftables, enable the nftables service with /etc/nftables.conf.

Multigaming 100% localFreeOpen access

Firewall rules generator

Turn a port list into ufw, iptables, nftables or Windows netsh rules for your game server.

Last updated: 10/9/2026

100% local processing — saved in your browser.

Documentation

Firewall

Ports to open

One per line: 25565/tcp, 2456-2458/udp, 30120 (TCP+UDP). Text after the port = comment.

Add a game's ports

Options

SSH port to keep

Allowed source IP (optional)

Address or CIDR; applies to all game rules.

Default policy: deny everything (SSH kept)

firewall-ufw.sh

Keep an SSH session open while applying.

# Generated by games-tools.game-rank.com
# Run as a sudo-capable user. Keep your SSH session open until you have tested a new one.
sudo ufw default deny incoming
sudo ufw default allow outgoing
sudo ufw allow 22/tcp comment 'SSH'
sudo ufw allow 30120/tcp comment 'Game 30120/tcp'
sudo ufw allow 30120/udp comment 'Game 30120/udp'
sudo ufw enable
sudo ufw status numbered

Server installation guideNo server yet? Install it locally or on a VPS / dedicated server, ports and firewall included.

How to use Firewall rules generator?

A well-configured firewall opens only the game and administration ports. This tool writes the commands for you for ufw, iptables, nftables or Windows, from a simple port list.

Choose the firewall: ufw (Ubuntu/Debian), iptables, nftables or Windows netsh.
Enter your ports (one per line, with protocol) or add a game's ports.
Check the SSH port and, if needed, restrict to a source IP (for example for RCON).
Copy or download the script, read it, then run it while keeping an SSH session open.

Read the full documentation →