Use 'link': Nessus Offline Activation License Already In
: A single code cannot be shared across multiple scanners. If you are migrating to a new server, the old one must be decommissioned or deactivated. Offline Plugin Updates : During registration, ensure you save the Custom URL
Finalise the activation on the offline system by running the registration command:
Paste your (License Key) into the second box. Click Submit . The portal will now successfully generate two items:
on the machine currently holding the license. Navigate to the Nessus installation directory : Windows: C:\Program Files\Tenable\Nessus\ Linux: /opt/nessus/sbin/ Run the de-registration command : nessuscli fetch --challenge Use code with caution. This will give you a challenge code. nessus offline activation license already in use
Tenable imposes restrictions on how often a professional license can be moved between hosts – typically, only a limited number of times within a 90‑day period. Exceeding this limit can freeze the license, requiring manual intervention from support.
The error appears during offline activation because the activation code provided—whether Professional, Expert, or the free Essentials version—has already been registered to a different device or system, and the license binding prevents it from being used elsewhere.
: Find your Nessus Professional license and click Manage Product . : A single code cannot be shared across multiple scanners
: Only the Primary Contact or Product Owner can reset activation codes in the Tenable Community.
When you perform an , you are essentially manually acting as the middleman. You take a challenge code from the scanner, paste it into the Tenable portal, and receive a license file (or activation code) to feed back to the scanner.
You must be the Primary Contact or Product Owner to perform this action. Log in to the Tenable Community portal. Go to in the top right corner. Click Submit
After restarting, log into the Nessus web interface at https://localhost:8834 and confirm the license is properly activated.
Go to the Nessus Offline Registration page on an internet-connected system. Enter your and your Activation Code . Click Submit .
