: If moving to a new server, always deactivate the license on the old host first using nessuscli fetch --deactivate (if the old host is still accessible) to avoid needing a portal reset.
: Find your Nessus Professional license and click Manage Product . nessus offline activation license already in use
/opt/nessus/sbin/nessus-fetch --challenge : If moving to a new server, always
Since a Nessus license is tied to a specific host's hardware (via a challenge code), you must release it from the old host first. to your account on the Tenable Community portal Navigate to My Products in the upper right corner. Select your Nessus Professional product and click Manage Product Reset Product Activation nessus offline activation license already in use