Run systemctl restart nessusd or service nessusd restart . Preventing the Error in the Future
Provide them with your Account ID, the specific Activation Code, and a brief explanation that you are rebuilding an air-gapped system. They can manually clear the hardware lock on the backend for you.
"C:\Program Files\Tenable\Nessus\nessuscli.exe" update all-2.0.tar.gz
To help me provide more specific steps, could you tell me your offline Nessus is installed on, and whether you are using Nessus Professional or Nessus Essentials ? Share public link
"C:\Program Files\Tenable\Nessus\nessuscli.exe" fetch --register-offline nessus.license
When deploying Nessus on virtual environments (VMware, Hyper-V, AWS), ensure the network adapter is assigned a static MAC address. Dynamic MAC changes alter the Challenge Code and break offline licensing.
Run the following command on the machine giving the error:
How to Fix the "Nessus Offline Activation License Already In Use" Error
This comprehensive guide will walk you through why this error happens and how to resolve it safely using Tenable Community Portal resets, command-line overrides, or proper migration workflows. Why This Error Happens