Nessus Offline Activation License Already In Use [top] [LATEST]

Understanding the Issue

• Symptom: New host gets “license in use” though token was never assigned elsewhere.
• Fix: Regenerate VM identifiers (change MAC, machine-id), then request a new activation or have Tenable reassign.

) and click "Manage Product" next to the relevant activation code. Click the "Reset" or "Reset Product Activation" link. nessus offline activation license already in use

Conclusion

The "Nessus offline activation license already in use" 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. Understanding the Issue

Full Reset: If the software itself is stuck in a weird state, you can use the nessuscli fix --reset command to wipe existing registration settings on the local host before trying again. Symptom: New host gets “license in use” though