LinuxSecurity.com

Datacenter proxies are simply IP addresses hosted in commercial data centers. No mystery there. They sit on cloud and hosting infrastructure that Linux security teams already monitor every day, often without labeling it as such.

Domain enumeration is a foundational defensive activity because security teams cannot protect assets they do not know exist. In modern Linux-based environments, organizations often accumulate more domains and subdomains than expected through cloud adoption, third-party services, temporary projects, and legacy infrastructure. These assets introduce risk quietly, especially when ownership and intent are no longer clear.

If you manage Linux systems in production, you already operate with multiple layers in place. Network firewalls, SELinux or AppArmor, IDS and IPS, and regular patching. From the operating system's perspective, the environment is controlled. Still, web applications running on top of that stack continue to be the source of incidents, audit findings, and late-night investigations. Not because the OS failed, but because most modern attacks never need to touch it.

UFW is a front-end for iptables that applies firewall policy directly on an Ubuntu server, close to the services that accept traffic.