Open your terminal or command prompt as an administrator and run the appropriate command for your operating system: For Windows:
If you continue to encounter issues after trying these solutions, reach out to Tenable Support with your activation code and purchase details. They can perform a deeper check on your license's backend status and determine if there are any further restrictions.
: Find your Nessus Professional or Expert code. If it’s assigned to a host, click the "Reset" or "Manage Product > Reset Product Activation" link.
Keep a simple spreadsheet:
Support can often reset or investigate license conflicts that are not resolvable through the self‑service portal. This is especially important when the license appears to be in use but you cannot locate the active instance.
: "C:\Program Files\Tenable\Nessus\nessuscli.exe" update C:\path\to\all-2.0.tar.gz
With the license reset, you must fetch the fresh hardware identifier from your isolated Nessus scanner. On Windows: Open the Command Prompt as an Administrator. Run the following command: nessus offline activation license already in use
nessuscli fetch --deregister
: Reinstalling the operating system changes the underlying hardware footprint, generating a new Challenge Code.
Once you have the challenge code and a "clean" activation code, you can generate the license file on an internet-connected machine. Go to the Nessus Offline Registration page . Enter your and Activation Code . Click Submit . Open your terminal or command prompt as an
Look for a button or link labeled or Manage Products .
To fix this, you must reset the activation code through the Tenable Support Portal or Community before you can generate a new offline license file ( nessus.license ). 1. Reset the Activation Code
Look for the button (sometimes labeled as a trash can icon or "Manage Product"). If it’s assigned to a host, click the
Solutions: "Nessus Offline Activation License Already in Use"