Nessus Offline Activation License Already In Use [2025]

Select your product type (e.g., Nessus Professional or Expert). Step 2: Reset the Product Activation

The error is a classic symptom of hardware identity mismatch in air-gapped environments. It is not a bug—it is a security feature preventing license theft. However, it is a frustrating feature when legitimate hardware fails or gets cloned.

Ensure you are using the generated by the current installation ( nessuscli fetch --challenge ). Download the nessus.license file again. Copy the new file to the offline machine: Windows: C:\ProgramData\Tenable\Nessus\conf\ Linux: /opt/nessus/etc/nessus/ Restart the Nessus service. How to Prevent This Issue in the Future nessus offline activation license already in use

Move the downloaded nessus.license file to your offline Nessus machine via a secure file transfer method (e.g., USB drive, SFTP). On Windows: Open Command Prompt as an Administrator. Register the license file by running:

Download the nessus.license file and the plugin compressed TAR file. 4. Apply the license offline Select your product type (e

This article provides a comprehensive guide to understanding why this happens, how to troubleshoot the error, and steps to resolve it to get your Nessus instance up and running. Why Does "License Already in Use" Occur?

You reverted a virtual machine to a snapshot taken before the license was activated, causing the license to mismatch, and then tried to re-activate. However, it is a frustrating feature when legitimate

: Only the Primary Contact or Product Owner can reset activation codes in the Tenable Community.

Click the link. This makes the code available for a new installation without changing the code itself. 2. Generate a new challenge code