Nessus Offline Activation License Already In Use [updated] -

What (Windows, RHEL, Ubuntu) is your Nessus scanner running on?

: Transfer the nessus.license file to the offline machine and register it using the command line:

The nessuscli commands were not executed in the correct sequence, or the challenge code was misused. Step-by-Step Resolution: Resetting the License

Trying to use one license on two active scanners at the same time. Step 1: Reset the License in Tenable Community nessus offline activation license already in use

Navigate to the section in the top right corner.

Nessus licensing works on a "one code, one scanner" basis. If you are performing an offline activation, it is highly likely that you (or a colleague) attempted an first.

If your organization frequently provisions and tears down offline scanning environments (such as infrastructure-as-code pipelines), resetting licenses manually through a browser is inefficient. You can leverage the Tenable.ot or Tenable Vulnerability Management APIs to programmatically release and regenerate activation codes before spinning up new offline instances. Avoiding Future License Locks What (Windows, RHEL, Ubuntu) is your Nessus scanner

: Replacing or modifying the primary network interface card (NIC) alters the MAC address used to generate the Challenge Code.

You bring that code to an internet-connected device to generate a license file ( nessus.license ) via the Tenable website.

With the reset license and new challenge code, you can now fetch your registration components. Visit the . Paste your Challenge Code into the first text field. Paste your Activation Code into the second text field. Click Submit . Download the nessus.license file to your local computer. Step 1: Reset the License in Tenable Community

[Related search suggestions will be provided.]

Locate the specific Nessus activation code that is throwing the error.

licenses are unique to a specific "challenge code" generated by the host machine, you cannot simply reuse the same activation code on a new system without first unlinking it from the old one. Why This Error Occurs

: Click the Reset Product Activation link. Confirm the action when prompted. This "unlinks" the code from any previous host, making it available for a fresh offline registration. Step 2: Generate a New Challenge Code

Copy the long string of alphanumeric characters displayed in the output. Step 3: Download the License and Plugins