: "C:\Program Files\Tenable\Nessus\nessuscli.exe" fix --reset macOS : /Library/Nessus/run/sbin/nessuscli fix --reset Step 3: Generate a New Challenge Key
sudo /opt/nessus/sbin/nessuscli fetch --deregister
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Enter your freshly reset into the bottom text box. Click Submit . nessus offline activation license already in use full
Click the or Unlink button next to the license status.
Nessus offline licenses generate a challenge code based on the system time, hostname, and network interface. The activation file is unique to that moment. If the file is generated and applied, the license is consumed. But if the scanner is never connected to the internet, how could Tenable’s servers know it was in use? They couldn’t. Which meant the error wasn’t coming from Tenable.
Reinstalling Nessus without resetting the license triggers a duplicate registration attempt. : "C:\Program Files\Tenable\Nessus\nessuscli
If you continue to face the "License Already In Use" error after following these steps, you may have reached your maximum self-service portal resets. In this scenario, you must open a ticket with Tenable Technical Support to have them manually clear the lock on their backend. To help troubleshoot further, please share: The hosting your offline Nessus instance. Whether this is a virtual machine or physical hardware.
If you manage a dynamic scanning environment requiring frequent license moves (for example, disposable cloud instances or CI/CD pipeline scanners), the standard activation code reset model may prove too restrictive. In such cases, consider:
When performing offline activation via the command line, you might see: Can’t copy the link right now
If you still see after these steps, your license key itself may be permanently locked. In that case, you need a new license key (e.g., trial extension or new purchase).
The "License Already In Use" error occurs due to Tenable's strict license management system. Each Nessus activation code connects to a unique hardware footprint.
On an internet-connected device, open a browser and go to the . Paste your new Challenge Code into the first field. Paste your Activation Code into the second field. Click Submit . Download the file named nessus.license .