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ufw firewall

Source: pimylifeup.com
```
sudo apt update
sudo apt upgrade
```
```
sudo apt install ufw
```
By default, UFW configures your Raspberry Pi’s firewall to block all incoming connections.
allow ports:
```
sudo ufw allow 80
sudo ufw allow 443
sudo ufw allow 22
```
start ufw
```
sudo ufw enable
```
type "y" and ENTER.
```
sudo ufw status
```
```
sudo ufw disable
```

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