Nessus Offline Activation License Already In Use

Issue: Nessus offline activation — license already in use

Summary

The Nessus offline activation process failed because the activation/license is already in use on another scanner or another activation ID has been previously applied. This document explains likely causes, how to verify, and step-by-step remediation options (preserving scans and configuration where possible).

Hardware Changes: If you changed the network interface card (NIC), CPU, or hostname, the Challenge Code changes, making Tenable think it's a new device. nessus offline activation license already in use

Contact support and request release/reassignment of the activation token; include the above data for a faster resolution.

Support can often release tokens, reassign license records, or provide a new activation file for offline installs.

Select the product type and click Manage Product next to your Nessus license. Issue: Nessus offline activation — license already in