Nessus Offline Activation Jun 2026

For systems without direct internet access (air-gapped networks), Nessus cannot activate automatically. You must use the offline activation method, which generates a challenge code on the scanner and then obtains a license file from Tenable’s portal using an internet-connected machine.

You need this code to identify your specific Nessus installation to Tenable's servers. nessus offline activation

The machine where Nessus is installed.

/opt/nessus/sbin/nessuscli fetch --register-offline The machine where Nessus is installed

Before proceeding to the online portal, ensure you have your . This is usually a 20-character string received via email after purchase or registration. You can also find it by logging into the Tenable Community portal and navigating to the "Products" or "Manage Product" section. Step 3: Generate the License and Plugin URL Now, move to your internet-connected machine ( Computer B ). Install Tenable Nessus Offline You can also find it by logging into

Log into your offline system (Computer A) and open a command-line interface (CLI).