: Save the alphanumeric challenge code provided by the output. Phase 3: Activating the License Offline
: Access the Tenable Community Portal using your registered email and password.
The "nessus offline activation license already in use" error typically occurs when attempting to activate a Nessus scanner using an offline activation license that is already associated with another system or scanner. This error can arise due to various reasons, including: nessus offline activation license already in use
: Confirm the reset. Your activation code is now "available" for a new installation. Phase 2: Generating a New Challenge Key
: Select "My Products" in the top right, then choose your product type (e.g., Nessus Professional). : Save the alphanumeric challenge code provided by
To fix the "already in use" error, you must first unbind the license from its old host. This is done through the .
Open a support ticket with Tenable. Provide: This error can arise due to various reasons,
Now request a using this fresh challenge code.
Especially on Linux, set a permanent hostname in /etc/hostname and /etc/hosts before first activation. Changing hostname after activation can cause a fingerprint mismatch.