• With activated DRI3 and an AMD GPU Citrix H.264 acceleration plugin could freeze. Selective H.264 mode (API v2) is not affected from this issue.
  • Citrix has known issues with GStreamer1.0 which describe problems with multimedia redirection of H.264, MPEG1 and MPEG2. GStreamer1.0 is used if browser content redirection is active.
  • Browser content redirection does not work with activated DRI3 and hardware accelerated H.264 deep compression codec.
  • Citrix StoreFront login with Gemalto smartcard middleware does not detect smartcard correctly if the card is inserted after start of login.
    Workaround: Insert the smartcard before starting the StoreFront login.
  • Citrix H.264 acceleration plugin does not work if server policy Optimize for 3D graphics workload is enabled together with server policy Use video codec compression > For the entire screen.
  • To launch multiple desktop sessions with Citrix HDX RTME and Citrix H.264 acceleration plugin a registry key must be enabled. 

    ParameterActivate workaround for dual RTME sessions and H264 acceleration
    Valueenabled / disabled

    This workaround is not applicable when "Enable Secure ICA" is active for the specific delivery group.

  • Multimedia redirection isn't working if "HDX RealTime Media Engine" is enabled at the same time.
    Workaround: Switch off HDX RealTime Media Engine.

    IGEL Setup

    Sessions > Citrix > Citrix Global > HDX Multimedia

    Sessions > Citrix > Citrix Global > Unified Communications > Skype for Business

    ParameterHDX RealTime Media Engine
    Valueenabled / disabled
  • With Citrix Workspace App 19.10.0 or 19.8.0 the session sometimes freezes while session logoff from a published desktop. :
    Workaround: Use CWA 18.10.0.

    IGEL Setup

    Sessions > Citrix > Citrix Global > Citrix Client Selection

    ParameterCitrix client version
    RangeDefault (19.10.0) / 18.10.0 / 19.8.0 / 19.10.0

VMware Horizon

  • After disconnect of an RDP based session, the Horizon main window which contains the server or sessions overview cannot be resized anymore.
  • Seamless application windows in Horizon Client may not be displayed correctly.  When starting the first seamless app a new iconified window appears in the  taskbar and only if you click on it the application will show up.
  • Client drive mapping and USB redirection for storage devices should not be enabled both at the same time.
    • On the one hand, when using USB redirection for storage devices: The USB on-insertion feature is only working when the client drive mapping is switched off. In the IGEL Setup client drive mapping can be found in: Sessions > Horizon Client > Horizon Client Global > Drive Mapping > Enable Drive Mapping. It is also recommended to disable local Storage Hotplug on setup page Devices > Storage Devices > Storage Hotplug.
    • On the other hand, when using drive mapping instead, it is recommended to either switch off USB redirection entirely or at least deny storage devices by adding a filter to the USB class rules. Furthermore Horizon Client relies on the OS to mount the storage devices itself. Enable local `Storage Hotplug` on setup page Devices > Storage Devices > Storage Hotplug.
  • External drives mounted already before connection do not appear in the remote desktop. Workaround: map the directory /media as a drive. Then the external devices will show up inside the media drive.


  • TP-Link Archer T2UH WiFi adapters does not work after system suspend/resume. Workaround: Disable system suspend at IGEL Setup > System > Power Options > Shutdown.

Parallels Client

  • Native USB redirection does not work with Parallels Client.


  • In seldom cases the authentication hung when using A.E.T. SafeSign smartcards.

Appliance Mode

  • Appliance mode RHEV/Spice: spice-xpi firefox plugin is no longer supported. The Console Invocation has to allow 'Native' client (auto is also possible) and should be started in fullscreen to prevent any opening windows.


  • Multimedia redirection with GStreamer could fail with the Nouveau GPU driver.


  • Audio jack detection on Advantec POC-W243L doesn't work. Sound output goes through the headset connection and the internal speakers.
  • IGEL UD2 (D220) fails to restore the volume level of the speaker when the device used firmware version 11.01.110 before.


  • The current VirtualBox Guest Tools/Drivers will not work with VirtualBox 5.2.x or older hosts which leads to black screen and non working graphic.
    Workaround: Install with 'Failsafe Installation + Recovery' and set registry key x.drivers.force_vesa to true.
  • When running in VirtualBox virtualization, resizing the window will not automatically change desktop resolution of IGEL OS guest.


  • HP t730 could freeze when monitors with different resolutions are connected (1920x1200 + 2560x1440 + 3840x1600 for example). When this occors, the registry key x.drivers.kms.best_console_mode has to be set to disabled.
  • Some newer Delock 62599 active DisplayPort to DVI (4k) adapters only work with INTEL devices.