UFW

Uncomplicated FireWall

Installation

sudo apt install ufw

Configuration

If port 22/tcp is not allowed, ssh will be terminated and no connection will be possible any more!

sudo ufw default deny incoming
sudo ufw default allow outgoing

sudo ufw allow 22/tcp    # SSH
sudo ufw allow 80/tcp    # HTTP
sudo ufw allow 443/tcp   # HTTPS

sudo ufw enable

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