🚨 IMPORTANT 🚨

For each agent that you install, you must have a license available; if you don't, the machine(s) won't show up on your targets page. (eg. If you're installing the agent onto 10 machines, you must have 10 licenses available.)

For group deployment, have a read of this article.


Step 1: Download the agent installer (but don't launch it)

  • Head to the Nessus agent download page: https://www.tenable.com/downloads/nessus-agents

  • Search for the relevant .msi installer file:
    Newer version of Windows: NessusAgent-X.X.X-x64.msi

    Older version of Windows: NessusAgent-X.X.X-Win32.msi

  • Download the installer and take a note of the path*
    (If this was downloaded from a browser, hit the dropdown button and click 'Show in folder'. You'll then be able to copy the path.)

Step 2: Calculate the NESSUS_NAME

Open the Targets page > Add Targets > Internal targets

Click 'View configuration keys'

Copy the 'Prefix'

Your NESSUS_NAME is comprised of your Prefix and your DeviceName
(what you'd like the target to be named in the portal).

👇
eg. DQEGBQUAAAc_paul-laptop


Step 3: Install and link the agent

...when you're already in the right directory

  • Open a Command Prompt (cmd.exe) as Administrator

  • Run the relevant command (per your OS), making sure to update:

    • The KEY (please see above)

    • The NESSUS_NAME (please see above)

    • The agent version number (eg. -8.2.4-)

⚠️ Windows 11, 10, 8.1, 7, Server 2008 SP2 (32-bit)

msiexec /i "NessusAgent-[version]-Win32.msi" NESSUS_SERVER="cloud.tenable.com:443" NESSUS_KEY=[KEY] NESSUS_NAME=[Prefix_DeviceName] /qn

⚠️ Windows 11, 10, 8.1, 7, Server 2022, Server 2019, Server 2016, Server 2012 R2, Server 2012, Server 2008 SP1, Server 2008 R2 SP2 (64-bit)

msiexec /i "NessusAgent-[version]-x64.msi" NESSUS_SERVER="cloud.tenable.com:443" NESSUS_KEY=[KEY] NESSUS_NAME=[Prefix_DeviceName] /qn

⬇️ For example

msiexec /i "NessusAgent-8.2.4-x64.msi" NESSUS_SERVER="cloud.tenable.com:443" NESSUS_KEY=819652a91d674e8d5be08e21299f1a3c69bd9806c72e24bc05df6b32b8db7fe1 NESSUS_NAME=DQEGBQUAAAc_paul-laptop /qn

🤓 Or, to streamline the process further, you can automatically populate half of the NESSUS_NAME by using your machine's existing name:

msiexec /i "NessusAgent-[version]-x64.msi" NESSUS_SERVER="cloud.tenable.com:443" NESSUS_KEY=[KEY] NESSUS_NAME=[Your Prefix_%computername%] /qn

⬇️ For example

msiexec /i "NessusAgent-8.2.4-x64.msi" NESSUS_SERVER="cloud.tenable.com:443" NESSUS_KEY=819652a91d674e8d5be08e21299f1a3c69bd9806c72e24bc05df6b32b8db7fe1 NESSUS_NAME=DQEGBQUAAAc_%computername% /qn

...when you're adding the path manually

  • Open a Command Prompt (cmd.exe) as Administrator

  • Run the following command (per your OS), making sure to update:

    • The path to where the installer was downloaded (please see end of the article if you're not sure)

    • The KEY (please see above)

    • The NESSUS_NAME (please see above)

    • The agent version number (eg. -8.2.4-)

⚠️ Windows 11, 10, 8.1, 7, Server 2008 SP2 (32-bit)

msiexec /i "[the path to where the installer was downloaded]\NessusAgent-[version]-Win32.msi" NESSUS_SERVER="cloud.tenable.com:443" NESSUS_KEY=[Key] NESSUS_NAME=[Prefix_DeviceName] /qn

⚠️ Windows 11, 10, 8.1, 7, Server 2022, Server 2019, Server 2016, Server 2012 R2, Server 2012, Server 2008 SP1, Server 2008 R2 SP2 (64-bit)

msiexec /i "[the path to where the installer was downloaded]\NessusAgent-[version]-x64.msi" NESSUS_SERVER="cloud.tenable.com:443" NESSUS_KEY=[Key] NESSUS_NAME=[Prefix_DeviceName] /qn

⬇️ For example

msiexec /i "C:\Users\Intruder\Downloads\NessusAgent-8.2.4-x64.msi" NESSUS_SERVER="cloud.tenable.com:443" NESSUS_KEY=819652a91d674e8d5be08e21299f1a3c69bd9806c72e24bc05df6b32b8db7fe1 NESSUS_NAME=DQEGBQUAAAc_paul-laptop /qn

...when you don't know the path (try this)

  • Open a Command Prompt (cmd.exe) as Administrator

  • Run the relevant command (per your OS), making sure to update:

    • The KEY (please see above)

    • The NESSUS_NAME (please see above)

    • The agent version number (eg. -8.2.4-)

⚠️ Windows 11, 10, 8.1, 7, Server 2008 SP2 (32-bit)

msiexec /i "%userprofile%\Downloads\"NessusAgent-[version]-Win32.msi" NESSUS_SERVER="cloud.tenable.com:443" NESSUS_KEY=[KEY] NESSUS_NAME=[Prefix_DeviceName] /qn

⚠️ Windows 11, 10, 8.1, 7, Server 2022, Server 2019, Server 2016, Server 2012 R2, Server 2012, Server 2008 SP1, Server 2008 R2 SP2 (64-bit)

msiexec /i "%userprofile%\Downloads\"NessusAgent-[version]-Win64.msi" NESSUS_SERVER="cloud.tenable.com:443" NESSUS_KEY=[KEY] NESSUS_NAME=[Prefix_DeviceName] /qn

⬇️ For example

msiexec /i "%userprofile%\Downloads\"NessusAgent-8.2.4-x64.msi" NESSUS_SERVER="cloud.tenable.com:443" NESSUS_KEY=819652a91d674e8d5be08e21299f1a3c69bd9806c72e24bc05df6b32b8db7fe1 NESSUS_NAME=DQEGBQUAAAc_paul-laptop /qn

Step 4: Reboot your machine

Only applicable if you're on Windows 7 x64 Enterprise, Windows 8 Enterprise or Windows Server 2012.


**Default path for where the installer will download to:
C:\Users\[your username]\Downloads

⬇️ For example

msiexec /i "C:\Users\Intruder\Downloads\NessusAgent-8.2.4-x64.msi" NESSUS_SERVER="cloud.tenable.com:443" NESSUS_KEY=819652a91d674e8d5be08e21299f1a3c69bd9806c72e24bc05df6b32b8db7fe1 NESSUS_NAME=DQEGBQUAAAc_paul-laptop /qn

If the installer was downloaded from a browser, hit the dropdown button and click 'Show in folder'. You'll then be able to copy the exact path.


This article describes how to manually install the agent on a Windows device.
If you wish to individually install the agent on devices, you can use the installation wizard inside the platform.

Note: Internal vulnerability scanning is only available to Pro and Vanguard customers.

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