# Nessus

# Nessus quick install on Kali

To fire off a quick install on the Kali side, head to the Tenable downloads page and then copy the curl command to grab the installer, which will look something like:

curl --request GET \
  --url 'https://www.tenable.com/downloads/api/v2/pages/nessus/files/Nessus-10.8.2-debian10_amd64.deb' \
  --output 'Nessus-10.8.2-debian10_amd64.deb'

# Kick off the install

sudo dpkg -i Nessus-x.deb

# Startup the Nessus service

sudo systemctl start nessusd.service

# Finish configuration

Then visit your install at https://your.nessus.ip.address:8834 and continue with the rest of the install and setup.

# Reset forgotten password

If you at least know the username you can reset the forgotten password (Windows):

cd "c:\Program Files\Tenable\Nessus"
nessus chpasswd USER-GOES-HERE

# Fix "installation expired" error

If you fire up the GUI URL and get this error:

Installation Expired
This installation has expired.  If you believe that you are are seeing this screen in error, please take one of the following corrective actions...

(and then you're presented with some contact options)

Here's how you fix (on Windows):

cd "c:\Program Files\Tenable\Nessus"
nessuscli.exe fetch --register xxx
net stop "tenable nessus"
net start "tenable nessus"