Nessus 3.0 on Ubuntu 5.10 (Breezy)

by Justin Clarke

I for one have no particular problems with the fact that Nessus has gone to a closed source model from version 3, with the exception that this means I can’t run Nessus on some of my platforms of choice (ie, Gentoo Linux). However, since a package is available for Debian 3.x, I wondered if it would work on Ubuntu. This didn’t prove too difficult - I expect because Ubuntu is based on Debian 3.x and also because the Nessus developers have historically bundled their own versions of libraries to prevent library dependency issues (that seems to be the usual reason for not being able to install Debian packages on Ubuntu for me).

The install itself is fairly self explanatory:

  1. Download the Debian package (Nessus-3.0.0-debian3_i386.deb) from This will involve signing up to download the binary – the e-mail they send you will allow you to register the plugin feed, allowing access to all the new plugins Tenable write after a 7 day delay.

  2. Install the package using dpkg. This will install the package into the /opt/nessus/ directory:

    • sudo dpkg -i Nessus-3.0.0-debian3_i386.deb

  3. The install will perform several of the steps that you would have previously done manually – eg, it will add the nessus directory into the /etc/ file so that the libraries will load.

  4. Add in your admin user using the /opt/nessus/sbin/nessus-add-first-user script. This is a bit different from how it was previously done – you add the first user this way, and then add extra users using the more familiar /opt/nessus/sbin/nessus-adduser script.

  5. Break open your e-mail, and paste in the command line supplied to register your plugin feed.

  6. Start the nessus daemon:

    • /opt/nessus/sbin/nessusd –D

If you have a problem with the Nessus daemon not starting (or aborting when starting), try running /opt/nessus/sbin/nessusd -R and then restarting the dameon.

There are some other differences in the new version, it is well worth a peruse of the documentation. One of the major differences is that there is no longer a GUI client supplied with the package – this has been split into a separate NessusClient package that you will also need to download from, and compile and install yourself. The command line client, however, is supplied with the binary package.



2006-02-09 08:49:50
Unable to connect
Hi Justin,
I installed Nessus 2.2.6 on my KUbuntu using the Nessus-installer script on But for some reason I cannot connect to my nessusd.
I can see the nessusd running in the ps aux output. Also, if I issue netstat -anp, I see the nessusd running on port 1241.
When I try running the nessus client, I just get the error : "Could not open a connection to localhost". Also, I cannot connect from a remote machine.
Just to see if I could make any connections to this machine...I could connect to the nessus hosting machine using SSH. Also, I can open a telnet session on port 1241 from the remote machine. But I cannot connect with the client.
I've used the same nessus client to other nessusds. Could you guess what the problem is?


2006-02-09 09:00:38
Unable to connect
Hey dude,

Have you run the nessus-mkcert to make the server cert? And added a user using nessus-adduser?

BTW, If you're running the current KUbuntu, you should be able to get Nessus 3.0.1 working from the Debian 3.x .deb file.


2006-02-09 13:34:25
Unable to connect
yeah...I've run both the nessus-mkcert as well as the nessus-adduser. Not only that I'm using Authentication by password.