Unlike online activation, which happens instantly, offline activation requires a manual, multi-step process involving: from the air-gapped machine.
A secure, scanned USB drive or data transfer mechanism to move text strings and files between the online and offline environments. Step-by-Step Nessus Offline Registration Guide nessus offline registration hot
Return to your isolated environment with your portable media containing the registration files. Via the Web UI: Return to your open Nessus browser tab. Via the Web UI: Return to your open Nessus browser tab
Securing the Air-Gap: The Definitive Guide to Nessus Offline Registration Because your system is offline, automatic plugin updates
An activation license is only half the battle. A vulnerability scanner without updated plugins cannot detect modern exploits. Because your system is offline, automatic plugin updates will fail, requiring a manual update process.
Activating offline mode automatically disables features that require a live connection to Tenable feeds, including:
If you tried the "hot" method and Nessus is showing "Unlicensed - Contact Support," here is why: