# Firewall

### Show listening ports

```bash
# Show all listening TCP ports with process names
sudo ss -tlnp

# Show all listening UDP ports with process names
sudo ss -ulnp

# Show both TCP and UDP listening ports
sudo ss -tulnp
```

### Enable ssh (it it on 22 port)

```bash
sudo ufw allow ssh
sudo ufw allow OpenSSH
sudo ufw allow 22/tcp

```

### Enable firewall

```bash
sudo ufw enable
```