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How to activate Nessus professional in offline mode on windows platform

 In this blog, we will see how we can activate Nessus professional in windows platform but in offline mode. 

Offline mode means there will be no internet access on that server where Nessus will be installed. 

Here are the key steps:

  • You need Nessus professional license key.
  • Two systems. System A where internet access will be provided. System B where no internet access will be there. And in this System B, Nessus will be installed. 
  • Download Nessus .msi package from their official website from System A and take it to the system B. Install Nessus professional on System B. Once the installation is over, a webpage will automatically be opened and suggest you to click on connect via SSL. Click there. 
  • Once initialization is done, check the Register Offline check box and click on Continue. 
  • Select Nessus Professional and click on continue. 
  • Now you will be given a challenge code. You need to go to the offline registration site from system A and paste that challenge code on first box. Now in the second box you need to paste your nessus professional license key. Now click on submit. 
  • You will get plugins download url and along with the license key. Copy the license key and come back to the System B. Paste the key to the System B Nessus console for activation. It will be activated now after clicking continue. Now provide a username and password. 
  • Now download the plugins from the link from System A. Plugins name will be all-2.0.tar.gz
  • Remember the link you got is same for all time and fixed for your Nessus instance. If you need to update the plugins later, you need to re-download this plugins file from the same link and import it to the nessus as well. So save the plugins url. 
  • Now we need to incorporate those plugins into the Nessus. So from Services, stop Tenable Nessus service first on System B. 
  • Now run this command: C:\Program Files\Tenable\Nessus>nessuscli.exe update <path to the tar file all-2.0.tar.gz>
  • It will take around 30 minutes to complete. And you will see confirmation in the shell output. 
  • Once done, restart the Tenable Nessus service. Login to the Nessus now with the credentials that you created some while ago. It will take some more time to compile the injected plugins. Done. 


Avi

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