Look for a button or link labeled , Deregister , or Unlink .

/opt/nessus/sbin/nessuscli fetch --register-offline nessus.license

From a user experience (UX) perspective, this error is a failure of design for several reasons:

Tenable enforces a one-license-per-instance rule. Additionally, the company restricts how frequently a license can be moved between hosts. Typically, you are allowed only a limited number of reactivations within a 90-day period. Exceeding this limit may lock the license, requiring manual intervention from Tenable Support.

/opt/nessus/sbin/nessuscli fetch --register-offline nessus.license Use code with caution. Step 5: Update Your Plugins

The most effective way to clear this error is through the Tenable Community portal .

: Click the Reset Product Activation link. Confirm the action when prompted. This "unlinks" the code from any previous host, making it available for a fresh offline registration. Step 2: Generate a New Challenge Code

link. This unlinks the code from the previous machine and makes it available for a new registration. 2. Generate a New Challenge Code

Improperly completing the offline registration steps can lock the license in a "pending" state.

Install the Nessus package on your air-gapped system without completing the online registration process.

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