Nessus Offline Activation License Already In Use May 2026

When attempting a Nessus offline activation, the error indicating a license is "already in use" occurs because Tenable activation codes are restricted to one active host at a time . To resolve this,

To resolve this and successfully activate your offline instance, you must reset the activation code through the Tenable Support Portal or Community. Step 1: Reset the Activation Code nessus offline activation license already in use

If the key is assigned to another host or a previous host that should be released, use the Tenable account/licensing portal to release or reassign the activation, or contact Tenable support to free the key.
After Tenable confirms release, apply the offline activation again.

My Products

Only the primary contact or product owner can perform this action. Log in to the Tenable Community or Support Portal. Navigate to or Products and Activation Codes . When attempting a Nessus offline activation, the error

Solutions to Resolve the "License Already in Use" Error

Notes & best practices

Via Web Interface (if accessible): Go to Settings > Software License > Upload License and upload the new file.

Via Command Line:

/opt/nessus/sbin/nessus-fetch --register-offline /path/to/your/new_license.lic

Causes of the "License Already in Use" Error

Appendix: useful commands & logs


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Contents	ArArCALC
Chapter 4	Miscellaneous Tips and Bug Fixes
Topic 4.1.1	Changing Security Settings
Topic 4.1.2	Trusting Access to Visual Basic Project
Topic 4.1.3	Installing Microsoft Office with Web Components
Topic 4.1.5	How to Insert Symbols in Microsoft Excel