Here’s the standard process: Run this command on the Nessus host:
/opt/nessus/sbin/nessuscli fetch --register <online-activation-code> If you have a now, you cannot directly convert it — you need a standard online activation code from your Tenable account. 4. If registration fails because it’s already offline‑registered First reset the registration:
To switch Nessus from to Online Mode , you generally need to re‑register the scanner with a valid activation code while connected to the internet. Offline mode is typically used for air‑gapped networks where the scanner cannot reach Tenable’s cloud or license servers.
/opt/nessus/sbin/nessuscli fetch --deregister Then re‑register with an online code. sudo systemctl restart nessusd (or service nessusd restart ) 6. Verify online mode nessus-cli status You should see:
Nessus Offline Mode To Online Mode May 2026
Here’s the standard process: Run this command on the Nessus host:
/opt/nessus/sbin/nessuscli fetch --register <online-activation-code> If you have a now, you cannot directly convert it — you need a standard online activation code from your Tenable account. 4. If registration fails because it’s already offline‑registered First reset the registration: nessus offline mode to online mode
To switch Nessus from to Online Mode , you generally need to re‑register the scanner with a valid activation code while connected to the internet. Offline mode is typically used for air‑gapped networks where the scanner cannot reach Tenable’s cloud or license servers. Here’s the standard process: Run this command on
/opt/nessus/sbin/nessuscli fetch --deregister Then re‑register with an online code. sudo systemctl restart nessusd (or service nessusd restart ) 6. Verify online mode nessus-cli status You should see: If you have a now