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If you have any issues in connecting to the internet, you can choose to activate offline, as shown in the following screenshot:

In order for the Nessus to be activated offline, a challenge code is displayed on your local browser where the Nessus instance is running, or can be displayed manually by using the following commands:

On Linux, use the following command:

# /opt/nessus/sbin/nessuscli fetch --challenge

On FreeBSD, use the following command:

# /usr/local/nessus/sbin/nessuscli fetch --challenge

On macOS X, use the following command:

# /Library/Nessus/run/sbin/nessuscli fetch --challenge

On Windows, use the following command:

C:\Program Files\Tenable\Nessus>nessuscli.exe fetch --challenge

The preceding commands are configured to the default installation directory. Change the directory to the location where Nessus is installed on your machine.

You can copy this challenge code onto a machine where the internet is available, and generate a license using the offline module on the Nessus website at https://plugins.nessus.org/v2/offline.php, and generate a license string. This license string can be used on the machine, in either the browser or offline mode, using the following commands:

On Linux, use the following command:

# /opt/nessus/sbin/nessuscli fetch --register-offline /opt/nessus/etc/nessus/nessus.license

On FreeBSD, use the following command:

# /usr/local/nessus/sbin/nessuscli fetch --register-offline /usr/local/nessus/etc/nessus/nessus.license

On macOS X, use the following command:

# /Library/Nessus/run/sbin/nessuscli fetch --register-offline /Library/Nessus/run/etc/nessus/nessus.license

On Windows, use the following command:

C:\Program Files\Tenable\Nessus>nessuscli.exe fetch --register-offline "C:\ProgramData\Tenable\Nessus\conf\nessus.license"

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