FireDaemon Zero and Zero OEM 2.6.1

FireDaemon Zero allows you to switch to and manage interactive FireDaemon Pro and Microsoft Windows services running on Session 0. FireDaemon Zero 2 works with FireDaemon ZeroInput.

End User Download - FireDaemon Zero 2.6

Your FireDaemon Session 0 Viewer 1 license key will NOT work with FireDaemon Zero 2. You will need to get an upgrade license key. See the Get New License Keys section below. Please make sure you read the release notes below before upgrading!

FireDaemon Zero 2.6.1 64-bit / x64

March 2021 - 30-day trial

FireDaemon Zero 2.6.1 32-bit / x86

March 2021 - 30-day trial

For Microsoft Windows
Windows 8.1, 10, 11
Server 2012, 2012 R2, 2016, 2019, 2022

For Microsoft Windows

Windows 8.1, 10

IMPORTANT: you may need to reboot your machine after installing this update by virtue of this version now deploying the latest Microsoft Visual Studio C++ 2015-2022 runtime.

Integrator Download - FireDaemon Zero 2.6 OEM

FireDaemon Zero OEM customers can download product updates via the download link embedded in your Cleverbridge order confirmation or subscription renewal email. If you can't find that email or are unsure of your Cleverbridge reference number please contact us.

Deployment Matrix

Before deploying FireDaemon Zero on any system, please refer to the deployment matrix for important information about compatibility and system requirements.

FireDaemon Zero 2.6 New Features

  • Product has been renamed from Session 0 Viewer to Zero
  • Updated installer graphics and icons
  • Updated Start Menu resource links
  • Zero Shell taskbar is resizable. Size and location are remembered.
  • FireDaemon ZeroInput aware (you can check via FDUI0Control query --fdui0input-state).
  • Maximised windows are returned to their maximised state when restored from their entry in Zero Shell
  • You can use the mouse wheel to scroll through the Zero Shell application list
  • Zero Shell lists the Windows services associated with the process running on Session 0
  • New extensive command-line help: FDUI0Control --help
  • Version checking
  • Zero is DPI aware on your logged-in session as well as Session 0
  • Automatic return from Session 0 idle timeout
  • Audit logging of users taking control of and kicking other users out of Session 0
  • Please consult the Change Log for the list of recent improvements and fixes.

Buy FireDaemon Zero 2.6

To purchase FireDaemon Zero 2 please visit the FireDaemon Zero 2 pricing information page.

FireDaemon Zero 2.6 Documentation

Please consult the User Guide. It contains the necessary information on how to install and use FireDaemon Zero.

Before Upgrading To FireDaemon Zero 2.6

Before you consider upgrading to FireDaemon Zero 2, please ensure you have completed the following pre-flight checks:


  • Ensure you backup and/or snapshot your machine.

Get New License Keys

  • FireDaemon Zero 2 and FireDaemon Zero 2 OEM is available on-demand to customers with a current Software Assurance contract. Please contact us to obtain your license keys or link to download OEM
  • If you don't have a Software Assurance subscription you can upgrade for 50% off the base license price. Please contact us to obtain your discount coupon
  • You can purchase new Zero 2 licenses with optional Technical Support and Software Assurance subscriptions. Please see the pricing page for more information.

Check Your Upgrade Path

  • If you have Session 0 Viewer 1 installed, this product will be removed and replaced with Zero 2
  • If you currently have Zero 2 installed, your version will be upgraded

Prepare for the Upgrade

  • If you have applied your FireDaemon Zero 2 license key, then your license key will be preserved during the upgrade
  • You may need to reboot your machine after installation by virtue of FireDaemon Zero 2 now deploying the latest Microsoft Visual Studio runtime.

Interactive Services Detection Service Has Been Removed From Windows 10 1803 or later and Server 2019

Microsoft removed the Interactive Services Detection Service entirely on Windows 10 1803 or later and Server 2019. Hence,  it's no longer possible to actually switch to Session 0 on those OS versions. If you are running Windows 10 1709 or earlier versions of Windows then Session 0 access still works as normal. If you have FireDaemon Zero installed and you upgraded to Windows 10 1803, the Interactive Service Detection Service will be preserved, however, when you switch desktop, you will switch to a blank screen. You will need to deploy our ZeroInput driver to resolve this issue.

Forced Relogin When Returning from Session 0 on Windows 10 1809 and Server 2019 1809

If you RDP into Windows 10 1809 or Server 2019 1809 and switch desktop to Session 0 then attempt to switch back to your logged-in session - you will always be returned to the Windows login screen. We have no fix or workaround for this. Note that you do not see this behaviour if you are logged directly into the Windows 10 1809 or Windows Server 2019 1809 console.

No Access To Session 0 via RDP on Windows 10 1903 or later

Switching to Session 0 on Windows 10 1903 or later over RDP no longer works. It would appear Microsoft is now actively blocked the contents of the Session 0 desktop from being rendered in the RDP session and / or dropping the RDP session entirely. If you try switching to Session 0 your RDP session will hang, you will have to forcibly disconnect and then reconnect to your computer. The only workarounds that we know of are:

  • to login to the physical console session of your computer directly (e.g. via physical keyboard and mouse, via hardware-based computer gateways such as Dell iDRAC or HP ILO, or via virtual machine console offered by VMware vSphere or equivalent).
  • abandon Microsoft RDP entirely and try using an alternate remote control product instead such as TightVNC, TeamViewer or TSplus. Your mileage may vary depending on the remote control tool you choose and the particular version of Windows 10 or Server 2019 you use. From our testing, we have found TightVNC, TeamViewer, and TSplus work reliably on Windows 10 1903, 1909, 2004, and 20H2 in conjunction with the latest versions of FireDaemon Zero and ZeroInput. However, that might change so test carefully and re-test after any Windows updates have been applied. If you deploy TightVNC ensure you install the DFMirage driver to ensure that console applications are displayed correctly. You can download DFMirage from the TightVNC website.

RDP Session Freeze When Switching to Session 0 on the Console Session on Server 2012 R2, 2016 and Server 2019

If you connect to the physical console of your Windows Server (i.e. the desktop into which the keyboard and mouse are connected) and then switch desktop to Session 0, all existing RDP sessions will freeze until you return from Session 0. From our investigations, this appears to be due to an unresolvable issue in the terminpt.sys driver that is used by the "Remote Desktop Keyboard Device" and "Remote Desktop Mouse Device". There's no fix nor workaround.

Bugs? Issues? Feature Requests?

Tell us what you think! All feedback gratefully received!


Below is Zero in action! Interactive services are installed with FireDaemon Pro 4. Session 0 keyboard and mouse control is restored with FireDaemon ZeroInput. The screenshot below is of Session 0 running two interactive FireDaemon Pro services.

FireDaemon Zero + ZeroInput Running On Session 0

The screenshot below is of the regular logged-in Windows session showing FireDaemon Pro, FireDaemon Zero Global Preferences, and the FireDaemon Zero Task Tray icon.

FireDaemon Pro and FireDaemon Zero Running In The User's Session