Re-run offline activation with correct file

/opt/nessus/sbin/nessuscli fetch --register-offline nessus.license Use code with caution.

Copy the long string of alphanumeric characters displayed in the output. Step 2: Download the License File and Plugins

Ensure you are not attempting to register a single-seat license (like Nessus Professional) on multiple live instances simultaneously.If you need to move Nessus frequently, automate the license reset process using the Tenable API.

If you’d like, I can:

This error typically triggers when the Tenable activation systems believe your unique license key is already bound to an active Nessus installation. This comprehensive guide explains why this error happens and provides step-by-step solutions to resolve it. Understanding the Root Cause

Accidentally attempting to use the same license key on a secondary test environment or backup scanner. Step 1: Reset the License via the Tenable Community Portal

Enter your Activation Code and the Challenge Code to generate a or use the UI to reset your license .

Finalise the activation on the offline system by running the registration command: