The most direct way to resolve this is to reset your license through the Tenable Support Portal or the Tenable Community site. Log in to your account. Navigate to the Products or Licenses section.
The solution depends on your goal: Do you want to keep the new hardware (scenario 2/3) or revert to the old hardware (scenario 1)? nessus offline activation license already in use
: If the software itself is stuck in a weird state, you can use the nessuscli fix --reset command to wipe existing registration settings on the local host before trying again. The most direct way to resolve this is
On your offline Nessus machine, you need a unique challenge code tied to that specific hardware. /opt/nessus/sbin/nessuscli fetch --challenge nessus offline activation license already in use