Copy the provided URL on that page to manually download the all-2.0.tar.gz plugins file later if needed. Step 4: Register the License on the Offline Scanner
On a device with internet access, navigate to the Tenable Offline Activation Page.
Key points to understand about Nessus licensing: nessus offline activation license already in use
Transfer the downloaded files to your isolated Nessus host via secure media. Apply the License File
If standard solutions do not work, consider these advanced steps. Copy the provided URL on that page to
The Nessus offline activation process failed because the activation/license is already in use on another scanner or another activation ID has been previously applied. This document explains likely causes, how to verify, and step-by-step remediation options (preserving scans and configuration where possible).
If you cannot reset your current activation code (for example, if you no longer have access to the original email or account), you may need to obtain a new one. Apply the License File If standard solutions do
Copy the newly generated string exactly. Do not use a challenge string saved from a previous day or an older installation. Step 3: Complete the Offline Activation Process
The license generated is strictly tied to the specific combination of activation code and challenge code. Even minor version mismatches between the installation and the generated license can cause activation to fail.
/opt/nessus/sbin/nessuscli fetch --deregister
