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April 24, 2026

Configure Keylogger Blocking

This page describes the keylogger blocking feature in Horizon Client for Windows.

The keylogger blocking feature detects any keylogger malware present in your client device. This feature secures and blocks malware from capturing your keystrokes when you use a remote desktop or application, thus protecting confidential and sensitive information.

When you connect to a remote desktop or application that requires keylogger blocking, Horizon Client automatically turns on the feature and displays user assistance screens to guide you through any necessary restart operations. In general, no manual configuration is required on the client to use keylogger blocking.

If you want to manually configure the keylogger blocking feature on your Windows client device, see the following procedure.

Note: The Settings > Security menu described below is the client menu from before you connect to a server, before you're authenticated to the server and seeing your entitled desktops and applications. The following screenshot illustrates the location of the Settings that has the Security entry.

Screenshot depicting the location of the Settings menu pre-login

  1. In the Windows client setting window, navigate to the Security tab and turn on the Keylogger Blocking feature. The following list describes the various states of the keylogger blocking feature:

    • When the Keylogger Blocking feature is turned on, the protection service is running and set to auto start, the client process is under full protection.

      This screenshot shows the Security screen with Keylogger Blocking enabled.

    • When the Keylogger Blocking feature is turned off, the protection service is stopped and set to manual start.

      This screenshot shows the Security screen with Keylogger Blocking deactivated.

    • When the Keylogger Blocking feature toggle switch is disabled and progress bar is visible, the protection service is starting or stopping, the toggle switch is disabled, and a progress bar is visible.

      Note: This state should only persist for several seconds.

      This screenshot shows the Security screen with Keylogger Blocking enabled but inaccessible while processing.

    • When the Keylogger Blocking feature toggle switch is disabled and the restart message appears, protection service is in the stopping state for some time and might not be able to stop on its own. Try to exit from all Horizon client programs and try stop the protection service. If the problem still persists, reboot your computer.

      This screenshot shows the Security screen with Warn before connecting and Thumbprint Verification enabled with Keylogger deactivated.

    • When the Keylogger Blocking feature toggle switch is enabled and restart message appears, the protection service is running but the client process is not protected. This state could occur when the feature is turned on and the client process has started before the driver and is not protected.

      This screenshot shows the Security screen with Warn before connecting and Thumbprint Verification enabled with Keylogger enabled.

    • When the Keylogger Blocking feature toggle switch is disabled and restart message appears, then there could be some problem causing the driver to not function properly, or the user must have manually uninstalled the feature.

      This screenshot shows the Security screen with Do not verify server cert, thumbprint deactivated and keylogger deactivated.

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