Nessus Offline Activation License Already In Use -

Once the license is freed on the portal side, you need to ensure your offline Nessus machine is generating a clean, accurate Challenge Code. Do not reuse an old challenge code text file. On Linux (Red Hat, CentOS, Ubuntu, etc.)

The error "license already in use" during a Nessus offline activation usually means the activation code is still linked to a previous installation or a different hardware profile . Because Nessus licenses are generally limited to one active scanner at a time, you must release the code from the old instance before the offline registration page will generate a new license file.

On your target offline Nessus machine, generate a unique challenge code by running:

If the "License Already in Use" error persists after following the steps above, check these edge cases: Check for Multiple Network Adapters nessus offline activation license already in use

When you submit these to the Tenable plugins portal, the system pairs them together. If you see the "License already in use" error, it means the Tenable license server has a record of that Activation Code being linked to a different Challenge Code. Common scenarios that trigger this conflict include:

This scenario is common in virtualized environments (VMware, VirtualBox, AWS, Azure).

Restart the application to force it to read the newly applied license configuration. systemctl restart nessusd Once the license is freed on the portal

To resolve this, you must in the Tenable Community. This action breaks the link between your license and the "old" machine, allowing you to use the same code on the new/current machine. Step 1: Access the Tenable Community Log in to the Tenable Community.

Transfer these to your offline machine and register the license using: : nessuscli fetch --register-offline nessus.license . Additional Troubleshooting

C:\Program Files\Tenable\Nessus\nessuscli.exe fetch --register-offline C:\path\to\nessus.license Common Troubleshooting Because Nessus licenses are generally limited to one

To resolve the "license already in use" error during a Nessus offline activation, you must reset the activation code through the Tenable Community portal before it can be applied to a new challenge code 1. Reset the Activation Code

: Access the Tenable Community Portal from an internet-connected device.

I can then provide specific command syntaxes or alternative troubleshooting steps tailored to your environment. Share public link

If none of the above steps resolve the issue, reach out to Nessus support for assistance. Provide detailed information about your setup, including:

Visit the Tenable Offline Registration Page on a machine with internet access. Enter your and Activation Code .