Licensing Requirements

Tenable Nessus Agents are licensed through the product that manages them: Tenable Nessus Manager or Tenable Vulnerability Management.

Tenable Nessus Manager

Tenable Nessus is available to operate either as a subscription or managed by Tenable Security Center. Tenable Nessus requires a plugin feed activation code to operate in subscription mode. This code identifies which version of Tenable Nessus that Tenable licensed you to install and use, and if applicable, how many IP addresses you can scan, how many remote scanners you can link to Tenable Nessus, and how many Tenable Nessus Agents you can link to Tenable Nessus Manager. Tenable Nessus Manager licenses are specific to your deployment size, especially for large deployments or deployments with multiple Tenable Nessus Manager instances. Discuss your requirements with your Tenable Customer Success Manager.

You must obtain the activation code before starting the installation process and setting up Tenable Nessus.

Your activation code:

• is a one-time code, unless your license or subscription changes, at which point Tenable issues you a new activation code.
• must be used with the Tenable Nessus installation within 24 hours.
• cannot be shared between scanners.
• is not case-sensitive.

• is required to manage Tenable Nessus offline.

  Note: For more information about managing Tenable Nessus offline, refer to the Tenable Nessus User Guide.

  Note: See the Obtain an Activation Code page to obtain and use an activation code.

For managed Tenable Nessus scanners, the activation code and plugin updates are managed from Tenable Security Center. You must start Tenable Nessus before it communicates with Tenable Security Center, which it normally does not do without a valid activation code and plugins. To have Tenable Nessus ignore this requirement and start (so that it can get the information from Tenable Security Center), when you register your scanner, select Managed by Security Center.