Product Documentation


Oct 03, 2013
For information about configuring firewall ports, see the following posts in Citrix forums:

To optimize performance of HDX RealTime conversations in XenDesktop virtual desktops and XenApp sessions, you can increase display memory.

To increase display memory in a XenDesktop virtual desktop or XenApp farm, you increase the Display memory limit of the Citrix Computer Policy Queuing and tossing. The recommended setting is between 8 and 16 MB.

Important: Increasing the display memory limit can affect the scalability of your XenApp farm, so do so with caution.

To modify Citrix Computer Policies, you must be a member of the Administrators group on the XenDesktop virtual desktop you are modifying and a Citrix Administrator for the XenApp farm you are modifying.

For more information for XenDesktop 5, see Working with XenDesktop Policies.

For information for XenApp 6.5 for Windows Server 2008 R2, see:
For information for XenApp 6 for Windows Server 2008 R2, see:

Configuring client devices for use with RemoteScan and Citrix HDX RealTime Optimization Pack

You can use RemoteScan to initiate scans directly from your virtual desktop to any TWAIN or WIA compliant scanner. To run RemoteScan on client devices in XenDesktop or XenApp environments using Microsoft Lync with the Citrix HDX RealTime Optimization Pack installed:
  1. Close RemoteScan if it is running on the client.
  2. Open RegEdit on client device and go to [HKEY_LOCAL_MACHINE]/SOFTWARE/Citrix/ICA client/Engine/configuration/Advanced/Modules/ICA 3.0.
  3. Remove RSICAWorkStationProxy from the VirtualDriver key.
  4. Add RSICAWorkStationProxy to the VirtualDriverEx key. Place it following all other virtual driver entries.
  5. On the client device, edit c:\program files\remotescan server\server.ini and add the following entry in the [server] section: noicaregistry=1
  6. Start RemoteScan on the device.