paths for a particular operating system like macOS or a specific Linux distribution? Update License Offline (Tenable Nessus 10.11)
To resolve the error during an offline activation, you must reset the activation code within your Tenable Community portal account . Tenable enforces a strict one-host-at-a-time licensing policy per activation code. If you attempt to generate an offline license file using an activation code tied to an existing or previous installation, the activation server blocks the request.
To fix the error, you must reset the activation code inside the Tenable Community Portal before completing your offline registration . Tenable ties a single Nessus Professional license to one active host or one unique hardware-generated challenge key at a time. If you reinstall Nessus, migrate your scanner, or regenerate a new challenge key on an air-gapped system, the registration server blocks the request because it sees the license as still active on another machine.
However, a notoriously frustrating error can appear during this process: (sometimes truncated as "License already in use" or "Activation limit reached" ). nessus offline activation license already in use full
Yes , he thought. And it always will be.
"C:\Program Files\Tenable\Nessus\nessuscli.exe" fetch --challenge
: After clicking submit, scroll to the bottom of the page to download the nessus.license file. 4. Apply the License to the Offline Scanner paths for a particular operating system like macOS
Nessus, the vulnerability scanner, required an offline activation license for air-gapped environments. The bank had purchased one in 2019. Perpetual. Non-transferable. Tied to a hardware fingerprint. But when Marcus tried to spin up a virtual instance to mirror the old scanner’s configuration, the activation portal threw a single, chilling error:
, register the file by running: "C:\Program Files\Tenable\Nessus\nessuscli.exe" fetch --register-offline nessus.license Step 5: Update the Scanner Plugins
Click on the button (or similar offline activation prompt). Select the Offline tab. Copy the new Challenge Code . Step 3: Get the New License File (Offline) If you attempt to generate an offline license
The “License already in use” error during offline Nessus activation means the license key is already tied to another scanner’s Challenge Code. Resolution requires releasing the license from the old system or contacting Tenable Support for a reset. Avoid sharing license files between machines or changing system identifiers after license generation.
After receiving my offline activation license, I attempted to activate it on my Nessus scanner. However, I was met with an error message stating that the license was already in use. I was confused, as I had not used the license previously. I contacted Tenable's support team, hoping for a quick resolution.
Tenable’s offline activation portal caches license usage for up to 1 hour. Wait 60 minutes, regenerate a new challenge file, and retry.
: There is a time limitation on how frequently you can reset the code via the portal. If you exceed this, you must Contact Tenable Support for a manual reset. Update License Offline (Tenable Nessus 10.12)