The "Nessus offline activation license already in use" error occurs because a Nessus activation code is restricted to a single host at a time. If you attempt to activate it on a new offline system while it is still associated with a previous installation—even one that was uninstalled—the registration will fail.
: Verify the details and click "Yes" . Your code is now "free" and ready for a new installation. 2. Generate a New Challenge Code nessus offline activation license already in use
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 The "Nessus offline activation license already in use"
: nessuscli.exe fetch --register-offline nessus.license Troubleshooting Tips Your code is now "free" and ready for a new installation
/opt/nessus/sbin/nessus-fetch --challenge
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