Release or reassign license via Tenable portal / support
Confirm the reset. This frees up the code to be paired with a new Challenge Code. Step 2: Generate a New Challenge Code
Set static MAC addresses on virtual networks to keep your challenge code from changing unexpectedly.
When you perform an , you are essentially manually acting as the middleman. You take a challenge code from the scanner, paste it into the Tenable portal, and receive a license file (or activation code) to feed back to the scanner. nessus offline activation license already in use
Most Nessus license types—particularly the free license—are typically limited to one activated scanner at a time. For Nessus Professional and Nessus Expert, a single activation code can be used across multiple scanners, but this is not the case for all license types. If you have attempted to install Nessus on a second system, your license will be flagged as already in use.
Enter your Challenge Code and your Activation Code .
"C:\Program Files\Tenable\Nessus\nessuscli.exe" fetch --register-offline nessus.license Use code with caution. Install the plugin package: Release or reassign license via Tenable portal /
The "License already in use" error during Nessus offline activation can seem daunting, but it can usually be resolved through careful verification of license keys, releasing licenses from previous installations, and communicating with Tenable Support when needed. By understanding the causes and taking preventative measures, Nessus users can minimize downtime and ensure their vulnerability scanning capabilities remain operational.
If your license is still active but you are unable to use it on your current machine, you can reset it directly through Tenable.
Use a machine with internet access to retrieve the final license file. Navigate to the Tenable Offline Registration page . When you perform an , you are essentially
Since a Nessus license is tied to a specific host's hardware (via a challenge code), you must release it from the old host first. to your account on the Tenable Community portal Navigate to My Products in the upper right corner. Select your Nessus Professional product and click Manage Product Reset Product Activation
How to Fix the "Nessus Offline Activation License Already in Use" Error