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Update Activation Code

In the event that you receive a new license with a corresponding activation code, you must register the new activation code in Nessus.

Note: If you are working with Nessus offline, see Manage Nessus Offline.

User Interface

  1. In Nessus, in the top navigation bar, click Settings.
  2. In the Overview tab, click the button next to the activation code.
  3. Type the activation code and click Activate.

    The license is now active on this instance of Nessus.

Command Line Interface

  1. On the system running Nessus, open a command prompt.
  2. Run the nessuscli fetch --register <Activation Code> command specific to your operating system.

    Platform Command


    # /opt/nessus/sbin/nessuscli fetch --register xxxx-xxxx-xxxx-xxxx


    # /usr/local/nessus/sbin/nessuscli fetch --register xxxx-xxxx-xxxx-xxxx

    Mac OS X

    # /Library/Nessus/run/sbin/nessuscli fetch --register xxxx-xxxx-xxxx-xxxx


    C:\Program Files\Tenable\Nessus>nessuscli.exe fetch --register xxxx-xxxx-xxxx-xxxx

    Nessus downloads and installs the Nessus engine and the latest Nessus plugins, and then restarts.

    Note: To register Nessus without automatically downloading and installing the latest updates, use the command nessuscli fetch --register-only.

Copyright 2017 Tenable, Inc. All rights reserved. Tenable Network Security, Nessus, SecurityCenter, SecurityCenter Continuous View and Log Correlation Engine are registered trademarks of Tenable, Inc.  Tenable,, Assure, and The Cyber Exposure Company are trademarks of Tenable, Inc.  All other products or services are trademarks of their respective owners.