What does ufw do?
ufw (Uncomplicated Firewall) is the official simplified front-end for iptables/nftables on Ubuntu and Debian. Instead of writing raw iptables rules, you work with readable commands like ufw allow 22/tcp, and ufw translates them into the necessary kernel-level rules behind the scenes.
This tool always starts with ufw default deny incoming and ufw default allow outgoing — the standard, secure baseline: block all incoming connections by default, only permit what you explicitly allow, and leave outbound traffic untouched. The rules you add above are layered on top of these two defaults.
The limit action is specifically recommended for SSH: if a single IP address attempts 6 or more connections to the same port within 30 seconds, ufw automatically starts denying that IP. It's a simple but effective safeguard against brute-force SSH login attempts — enabled with ufw limit ssh or ufw limit 22/tcp.
A classic and dangerous mistake: while connected to a remote server over SSH, running ufw enable before allowing the SSH port. The moment ufw activates, it starts denying all incoming traffic (including SSH) by default; your very next command drops the connection, and without console/KVM access you can't get back in. That's why this tool always pins the SSH safety warning to the top of every script it generates — make sure your SSH rule is in the list before you ever run ufw enable.
When should you use UFW Rule Generator?
The KEYDAL UFW Rule Generator tool is a browser-based utility that developers, system administrators, SEO specialists and enterprise technology teams use in their daily operations. It requires no installation, is free, and produces results instantly. It is designed so local teams can run audits without connecting to server environments and run analyses without touching production.
Typical scenarios include: post-migration verification, comparing domain or hosting providers, diagnosing customer issues, security auditing (pre-pentest reconnaissance), root-cause analysis of email deliverability problems, validating CDN or proxy configuration, surfacing technical audit data for SEO teams, and rapid information gathering during incident response. You can copy results as text and share them or paste them into internal documentation.
The KEYDAL infrastructure team provides web hosting, VPS, dedicated server management, server hardening, DNS configuration and SSL/TLS deployment services from Türkiye. Beyond these tools, we deliver server setup and operations support across Hetzner, OVHcloud, Contabo, DigitalOcean and Turkish providers.
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