Niver
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Niver's system configuration and documentation
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system/ufw.md

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Firewall

# apt install ufw
# ufw allow in 22 # SSH
# ufw allow in 53 # DNS
# ufw allow in 80 # Display an error message for unsecure HTTP
# ufw allow in 443 # HTTPS
# ufw allow in 1965 # Gemini
# ufw enable