If you are setting up this process for the first time, let me know: What your Nessus scanner runs on?
Log into your offline server's terminal or command prompt and fetch a string called a using the nessuscli tool. Linux: /opt/nessus/sbin/nessuscli fetch --challenge download nessusupdateplugins all20targz new
How to Download and Install all-2.0.tar.gz for Offline Nessus Plugin Updates If you are setting up this process for