VPS

Open firewall ports (ufw)

Use ufw on your Victus Ubuntu VPS to open the ports your apps need — web, game and custom services — without locking yourself out of SSH.

ufwfirewallportsopen portiptablessecurity

On a Victus KVM VPS you get a full public IP with no upstream port blocking, so opening a port is done inside the machine with a firewall. Ubuntu ships ufw (Uncomplicated Firewall), a friendly front-end to iptables. This article shows the safe order of operations so you never lock yourself out.

Allow SSH before you enable ufw

If you enable ufw with a default-deny policy and have NOT allowed port 22, your current SSH session survives but new connections are blocked — and you are locked out on the next disconnect. Always run "ufw allow OpenSSH" first.

Set up ufw safely

bash

# Install if missing
apt update && apt install -y ufw

# 1. ALWAYS allow SSH first
ufw allow OpenSSH        # or: ufw allow 22/tcp

# 2. Sensible defaults
ufw default deny incoming
ufw default allow outgoing

# 3. Turn it on
ufw enable

Open the ports your service needs

bash

# Web server
ufw allow 80/tcp
ufw allow 443/tcp

# A Minecraft-style TCP service
ufw allow 25565/tcp

# A UDP game/voice port
ufw allow 27015/udp

# A single IP only (e.g. your home connection)
ufw allow from 203.0.113.10 to any port 5432 proto tcp

Check and remove rules

bash

# List active rules with numbers
ufw status numbered

# Delete a rule by its number
ufw delete 3

# Delete by matching the original rule
ufw delete allow 80/tcp

Port	Protocol	Typical use
22	TCP	SSH (keep open!)
80 / 443	TCP	HTTP / HTTPS websites
25565	TCP	Minecraft server
3306 / 5432	TCP	MySQL / PostgreSQL (restrict by IP!)

Do not expose databases to the world

Never run a bare "ufw allow 3306/tcp". Restrict database and admin ports to specific source IPs, or keep them bound to localhost and reach them over an SSH tunnel.

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