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Linux Virtual Delivery Agent
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HDX screen sharing

November 19, 2024
Contributed by: 
C B C

Overview

The Linux VDA lets you share the screen of your virtual desktop with session users on other virtual desktops.

Note:

  • If session sharing occurs between multiple Linux VDAs, it is recommended to upgrade to the same VDA version to avoid keyboard input issues.

  • If different keyboard layouts exist between the viewer’s session and the sharer’s session, the sharer’s keyboard layout is effective.

  • It is recommended that the viewer’s Citrix Workspace app use Scancode mode, as there are more limitations when using Unicode mode.

  • Unicode mode in the Citrix Workspace app client might result in some characters not being recognized.

  • When using Unicode mode, it is recommended that the sharer and viewer use the same keyboard layout to avoid mixed output.

  • If shortcut key combinations are active in both the viewer and the sharer, they only take effect in the viewer.

  • If a shortcut key includes the Super key, it takes effect in the viewer and is also sent to the sharer.

The following example walks you through the procedure of sharing a screen and viewing someone else’s screen.

To share a screen:

  1. In the notification area of your virtual desktop, click the following system tray icon and select Screen sharing > Share my screen.

    Select the Share my screen menu

    Select the Share my screen menu

  2. Click Copy and Close.

    The current screen sharing code persists until you stop and restart sharing your screen.

    Copy the connection code

    Tip:

    While you are sharing your screen, there is a red border around it, indicating that sharing is in progress.

  3. Share the copied code with session users on other virtual desktops that you want to share your screen with.

  4. To let a viewer control your screen, select Give control and then the viewer’s name. To stop giving control, clear the viewer’s name.

    Give control

  5. To stop sharing your screen, select Stop sharing my screen.

    Select the Stop sharing my screen menu

To view someone else’s screen:

  1. In the notification area of your virtual desktop, click the screen sharing icon and select View someone else’s screen.

    Select the View someone else's screen menu

  2. Enter the connection code of the screen that you want to view and then click Connect.

    Enter the connection code

  3. Wait for the screen sharer to accept your request. For example:

    Accept or deny screen sharing

    Tip:

    • On the sharer side, the Linux system issues a notification of your request.
    • If the sharer does not accept your request within 30 seconds, your request expires and a prompt appears.

  4. After the screen sharer accepts your request by clicking OK, the shared screen appears in your Desktop Viewer. You are connected as a viewer with an automatically assigned user name.

    View a shared screen

  5. To request control over the shared screen, click the mouse icon in the upper left corner.

    Tip:

    • If the sharer does not accept your request within 30 seconds, your request expires.
    • Only one viewer is allowed to control a shared screen at a time.

    Click the mouse icon again to release control over the shared screen.

    Release control over a shared screen

  6. To disable display scaling or scale to the window size, click the icon next to the mouse icon.

    Window scaling

Configuration

The screen sharing feature is disabled by default. To enable it, complete the following settings:

  1. Enable the system tray.

  2. For Citrix Virtual Apps and Desktops 2112 and later, enable the ScreenSharing policy in Citrix Studio.

  3. (Optional) For Citrix Virtual Apps and Desktops 2109 and earlier, enable screen sharing on the Linux VDA by running the following command:

    sudo /opt/Citrix/VDA/bin/ctxreg update -k "HKLM\System\CurrentControlSet\Control\Citrix\Thinwire" -v "EnableScreenSharing" -d "0x00000001"
<!--NeedCopy-->

  4. Allow ports 52525–52625 in your firewall.

Considerations

  • The screen sharing feature does not support the H.265 video codec.

  • The screen sharing feature is not available for app sessions.

  • Users of desktop sessions can share their session screens with up to 10 viewers by default. The maximum number of viewers is configurable through ctxreg update -k "HKLM\System\CurrentControlSet\Control\Citrix\Thinwire" -v "ScreenSharingViewerMaxNum" -d <hex_value>. When the maximum number is reached, a prompt appears when users try to accept extra connection requests.

HDX screen sharing
November 19, 2024
Contributed by: 
C B C
November 19, 2024
Contributed by: 
C B C

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