Nessus Offline Activation License Already In Use 〈TOP〉

Troubleshooting the "License Already in Use" Error in Nessus Offline Activation

Introduction

Quick Diagnostic Check: Run the following command on your Nessus server to view the current system fingerprint: nessus offline activation license already in use

Fix A: Deactivating the Old License (The Correct Way)

If your old server is dead, decommissioned, or lost, you must release the license lock on Tenable’s side. Troubleshooting the "License Already in Use" Error in

• Stop Nessus (systemctl stop nessusd or service nessusd stop).
• Move or remove activation files (e.g., mv activation.* activation.*.bak in the Nessus var directory).
• Restart Nessus and reapply offline activation file.

Transfer the nessus.license file to your offline system and register it via the command line. Stop Nessus (systemctl stop nessusd or service nessusd stop)

: On your offline Nessus scanner, run the following command (or find it in the UI under Settings):