With the scanner redirection feature, you can scan information into remote desktops and applications with scanners that are connected to the local client system. This feature redirects scanning data with a significantly lower bandwidth than can be achieved by using USB redirection.

Scanner redirection supports standard scanning devices that are compatible with the TWAIN and WIA (Windows Image Acquisition) formats. Although you must have the scanner device drivers installed on the local client system, you do not need to install the scanner device drivers on the remote desktop operating system where the agent is installed.

If a Horizon administrator has configured the scanner redirection feature, and if you use the VMware Blast display protocol or the PCoIP display protocol, a scanner connected to your local system can be used in a remote desktop or application.

Important: Do not connect a scanner from the Connect USB Device menu in Horizon Client. The performance will be unusable.

When scanning data is redirected to a remote desktop or application, you cannot access the scanner on the local computer. Conversely, when a scanner is in use on the local computer, you cannot access it on the remote desktop or application.

Tips for Using the Scanner Redirection Feature

  • Click the scanner icon ( Use the scanner icon to connect a scanner to your remote desktolp ) in the system tray, or notification area, of the remote desktop to select a non-default scanner or to change configuration settings. On published applications, the system tray icon is redirected to the local client computer.

    You do not have to use the menu that appears when you click this icon. Scanner redirection works without any further configuration. The icon menu allows you to configure options such as changing which device to use if more than one device is connected to the local client computer.

    Note: If the menu that appears does not list any scanners it means that an incompatible scanner is connected to the client computer. If the scanner icon is not present, it means that the scanner redirection feature is disabled or not installed on the remote desktop. The scanner icon also does not appear on client systems that do not support this feature.
  • Click the Preferences option in the menu to select options to control image compression, hide webcams from the scanner redirection menu, and determine how to select the default scanner.

    You can select the option to hide webcams if you plan to use the Real-Time Audio-Video feature to redirect webcams, which is what VMware recommends. Use scanner redirection with webcams to take a photograph of yourself and scan it.

    Note: If a Horizon administrator has configured scanner redirection to use a specific scanner and that scanner is not available, scanner redirection will not work.
  • Although most TWAIN scanners display the a scanner settings dialog box by default, some do not. For those that do not display settings options, you can use the Preferences option in the scanner icon menu, and select Always show Scanner Settings dialog option.
  • Scanning too large an image or scanning at too high a resolution might not work. In this case, you might see the scanning progress indicator freeze, or the scanner application might exit unexpectedly. If you minimize the remote desktop, an error message might appear on the local client system, notifying you that the resolution is set too high. To resolve this issue, reduce the resolution or crop the image to a smaller size and scan again.