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Moving a Nessus VM to a new host often changes the hardware UUID, triggering a license mismatch. Step 1: Reset the Activation Code
To reset your activation code:
You built a Nessus scanner in a virtual environment (VMware/Hyper-V). You activated it offline successfully. Later, you cloned that VM to create a backup or a second scanner. Because the clone retains the original MAC address and UUID, the remains identical. nessus offline activation license already in use
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On a computer with internet access, go to the Nessus Offline Registration page .
nessuscli.exe fetch --register-offline "C:\path\to\nessus.license" : Moving a Nessus VM to a new
A link to download the ( all-2.0.tar.gz ).
Keep a simple spreadsheet:
Virtual machine deployments often change hardware signatures if the MAC address pool fluctuates. Assign static MAC addresses to your offline scanning VMs to ensure the challenge code remains identical across system reboots or snapshot restorations. To help troubleshoot further, let me know: What Operating System is your offline scanner running on? Later, you cloned that VM to create a
Reinstalling your operating system without unregistering the old Nessus instance first.
Move the nessus.license file to your offline scanner and register it via the command line.
When you retire a server, immediately the license via the Tenable portal before turning the server off.