This error triggers because Tenable associates your specific product license key with a unique hardware fingerprint (Challenge Code). If you attempt to apply the same license key to a new installation, a migrated server, or even a rebuilt virtual machine without clearing the old instance, Tenable’s activation server blocks the request to prevent unauthorized concurrent use.
C:\Program Files\Tenable\Nessus\nessuscli.exe fetch --challenge macOS: /Library/Nessus/run/sbin/nessuscli fetch --challenge Copy the alphanumeric string provided. 3. Obtain the license file
Paste your Challenge Code and your Activation Code into the boxes. Click Submit. nessus offline activation license already in use
Copy the long string of alphanumeric characters displayed in the output. Step 2: Download the License File and Plugins
Modifying virtual machine hardware triggers a new challenge code. This error triggers because Tenable associates your specific
"C:\Program Files\Tenable\Nessus\nessuscli.exe" fetch --register-offline nessus.license
Copy the long alphanumeric string displayed in the terminal output. Step 3: Obtain Your New Offline License File Copy the long string of alphanumeric characters displayed
Download the plugins archive and copy the license file text into a plain text file named nessus.license . Transfer both files via secure physical media (like a cleared USB drive or internal secure SFTP) to your isolated offline Nessus server. Step 4: Register the License and Plugins Offline