Nessus Offline Activation License Already In Use =link= Full Official
The error is a classic licensing conflict: your activation code is still locked to another scanner. By methodically working through the solutions presented in this guide—from deactivating the existing license, using command-line tools, performing manual file cleanup, leveraging the nessuscli fix --reset command, to ultimately generating a new activation code—you can resolve the error and get your offline Nessus scanner functioning properly. Always prioritize deactivation before moving licenses, and when in doubt, leverage official Tenable Support to avoid locked accounts or compliance issues.
the reset when prompted. The code is now free to be used on a new installation. Phase 2: Performing Offline Activation
Confirm the reset. The status of your activation code should now change to "Available" or "Unused." Step 2: Generate a New Challenge Code
Attempting to use the same Activation Code on a second scanner without a multi-license subscription. nessus offline activation license already in use full
After plugin installation completes, restart the Nessus service:
With your reset activation code and your new challenge code ready, you can now generate a fresh license key file ( nessus.license ).
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If you modify your offline VM’s MAC address, CPU count, or storage, the machine generates a brand new Challenge Key. The registration portal treats this as an entirely different computer.
The --deregister command may not be available in all Nessus versions. If your version lacks this option, resetting through the support portal or contacting Tenable support directly may be your only recourse.
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Back up your Nessus configuration, custom policies, and scan results before making major changes—particularly before license resets or deactivations. Critical directories include:
On your internet-connected computer, open a browser and go to the official Tenable Offline Plugin Registration Page . Paste your new into the top field. Input your Activation Code into the second field. Click Submit .