Wednesday, April 28, 2021

Security Onion 2.3.50 now available!

Last October, we released Security Onion 2.3:

Today, we are releasing Security Onion 2.3.50, which adds new features and resolves a few issues:


You can find our documentation here:

Documentation is always a work in progress and some documentation may be missing or incorrect. Please let us know if you notice any issues.

Known Issues

Please review the Known Issues list:

New Installations

If you want to perform a new installation, please review the 2.3 documentation and then you can find instructions here:

Existing 2.3 Installations

If you have an existing Security Onion 2.3 installation, please see:

AWS Marketplace

For new Security Onion 2 installations, version 2.3.50 is now also available on AWS Marketplace via the official Security Onion 2 AMI:

AMI Documentation:

Existing Security Onion 2 AMI users should use the "soup" command to upgrade:

Security Onion 16.04 EOL

As a reminder, Security Onion 16.04 has reached End Of Life (EOL):

If you're still running Security Onion 16.04, please see the following for upgrade options:

Questions or Problems

If you have questions or problems, please see our community support forum guidelines:

You can then find the community support forum at:


Lots of love went into this release!

Special thanks to all our folks working so hard to make this release happen!

  • Josh Brower
  • Jason Ertel
  • Wes Lambert
  • Josh Patterson
  • Mike Reeves
  • Bryant Treacle
  • William Wernert


Need training? Start with our free Security Onion Essentials training and then take a look at some of our other official Security Onion training, including our new Detection Playbook class!

Hardware Appliances

We know Security Onion's hardware needs, and our appliances are the perfect match for the platform. Leave the hardware research, testing, and support to us, so you can focus on what's important for your organization. Not only will you have confidence that your Security Onion deployment is running on the best-suited hardware, you will also be supporting future development and maintenance of the Security Onion project!

Starting in this release, Security Onion Console (SOC) automatically recognizes our official appliances:

Security Onion Console running on an SOS4000 appliance

Screenshot Tour

If you want the quickest and easiest way to try out Security Onion 2, just follow the screenshots below to install an Import node and then optionally enable the Analyst Workstation. This can be done in a minimal VM with only 4GB RAM!

Security Onion ISO Boot Menu

ISO Installation

ISO Installation Complete

After rebooting, login to start Setup

Setup Options

Choose the Setup type

Accept the Elastic License

Choose Standard or Airgap

Specify hostname

Setup checks for the common hostname of "securityonion"

Optionally enter a short description for the node

Select management NIC

Configure management NIC

Configure networking

Configure networking

Configure networking

Configure networking

Initialize networking

Select direct connection to Internet or specify proxy

Configure home network(s)

Create user account

Set password

Confirm password

Choose how you want to access the web interface

Optionally configure ntp servers

Optionally configure ntp servers

Optionally run so-allow

Specify IP address or range to allow through firewall

Confirm options

Setup complete

After rebooting and logging in, optionally run so-analyst-install

so-analyst-install complete

Enter username to login to desktop

Enter password to login to desktop

Analyst desktop

Analyst install includes Chromium, NetworkMiner, Wireshark, and many other analysis tools

Log into Security Onion Console (SOC)

SOC Overview Page

Use so-import-pcap to import one or more pcap files

Use the hyperlink provided by so-import-pcap to view all alerts and logs

Find an interesting stream and pivot to full packet capture

Switch to PCAP transcript mode

Download the PCAP and open directly in NetworkMiner for file extraction

All this in a minimal VM with only 4GB RAM!

Friday, April 16, 2021

Security Onion 16.04 has reached End Of Life

On 10/16/2020, we released Security Onion 2 and announced a 6-month EOL notice for Security Onion 16.04:

Security Onion 16.04 has now reached End Of Life. If you still have existing installations of Security Onion 16.04, please upgrade to Security Onion 2:

Thursday, April 1, 2021

Security Onion 2.3.40 Hotfix for Curator Closed Index Issue

If you're running Security Onion 2.3.40 on a standalone installation or a combined manager/search node, please see:

Security Onion Documentation printed book now updated for Security Onion 2.3.40!

Many folks have asked for a printed version of our official online documentation and we're excited to provide that!  Whether you work on airgap networks or simply want a portable reference that doesn't require an Internet connection or batteries, this is what you've been asking for.

Thanks to Richard Bejtlich for writing the inspiring foreword!

Proceeds go to the Rural Technology Fund!

This 20210326 edition has been updated for Security Onion 2.3.40 and includes a 40% discount code for our on-demand training!

This book covers the following Security Onion topics:
  • Getting Started
  • Security Onion Console (SOC)
  • Analyst VM
  • Network Visibility
  • Host Visibility
  • Logs
  • Updating
  • Accounts
  • Services
  • Customizing for Your Environment
  • Tuning
  • Tricks and Tips
  • Utilities


What is the difference between this book and the online documentation?

This book is the online documentation formatted specifically for print.  It also includes an inspiring foreword by Richard Bejtlich that is not available anywhere else!  Proceeds go to the Rural Technology Fund!  Finally, the printed book includes a 40% discount code for our on-demand training.

Who should get this book?

You should get this book if you work on airgap networks or simply want a portable reference that doesn't require an Internet connection or batteries! Also anyone who wants to donate to a worthy cause like Rural Technology Fund!

What is the difference between this edition and the previous edition?

This edition has been updated for Security Onion 2.3.40!

Where do we get it?

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