Citrix Virtual Apps and Desktops 2003 Whats New

Since last week Citrix’s latest version of Citrix Virtual Apps and Desktops software became available for the public. This blog will go into some detail in what is new with this version.

Link to documentation:

https://docs.citrix.com/en-us/citrix-virtual-apps-desktops

Link to download:

https://www.citrix.com/downloads/citrix-virtual-apps-and-desktops/product-software/citrix-virtual-apps-and-desktops-2003.html

Changes in host support for Current Releases

As of Citrix Virtual Apps and Desktops 7 2003, current releases of that product do not support VDAs (machines that deliver apps and desktops) on the following hosts:

  • Amazon Web Services (includes VMware Cloud on AWS)
  • CloudPlatform (refers to the original Citrix software platform)
  • Microsoft Azure (includes Azure Resource Manager and Azure Classic)

What is supported:

For Current Release (CR) customers, Citrix Virtual Apps and Desktops 7 supports the host and virtualization resources listed in each release’s system requirements documentation.

For example, the supported hosts for the latest (newest) CR are listed in that release’s system requirements.

For Long Term Service Release (LTSR) customers, Citrix continues to support the hosts listed for each of those releases. Some of those LTSRs support VDAs on one or more cloud hosts that are no longer supported on CRs.

For example, Citrix Virtual Apps and Desktops 7 1912 LTSR (and its cumulative updates, when released) supports the hosts listed in that release’s system requirements.

Virtual Delivery Agents (VDAs) 2003

Version 2003 of the Windows VDA for Multi-session OS and the VDA for Single-session OS includes the following enhancements (in addition to the VDA installation and upgrade items listed previously in this article).

Enhanced browser content redirection routing using new proxy configuration options

We have added other configuration options for the proxy settings on the VDA. You can choose from these options:

Direct or transparent – Routes browser content redirection traffic through the VDA and forwards it directly to the web server hosting the content.

Explicit proxy (was previously included) – Routes browser content redirection traffic through the VDA and forwards it to the specified web proxy.

PAC files – Routes browser content redirection traffic through the VDA and forwards it to the web proxy determined by evaluating the specified PAC file.

Enhanced Build to lossless

Build to lossless is enhanced with automatic image detection. Previously, Build to lossless assumed a lossy-first approach. In that approach, all moving imagery is encoded using H.264 (or H.265) and then is progressively sharpened to lossless when movement ceases. Sometimes staying lossless is preferable. The new automatic image detection feature performs some light image analysis on each frame. This feature determines whether to send the frame lossless; thus, skipping the lossy-first step.

To revert to lossy-first, set this registry key on the VDA:

HKEY_LOCAL_MACHINE\SOFTWARE\Citrix\Graphics

Name: BTLLossyThreshold

Type: REG_DWORD

Data: 0

Multi-Stream virtual channel stream assignment

In previous releases, you used a registry setting to change the virtual channel assignment when using multi-stream ICA. This release includes policy settings for assigning virtual channels

Enhanced support for electron-based apps in multi-session OS VDA

We now support electron-based apps. Electron is an open-source framework for developing desktop GUI applications. For example, Microsoft Teams and Slack.

Wait for printers to be created before an application starts

The wait for printers to be created feature is now available for Citrix Virtual Apps. Using a PowerShell cmdlet running on a Delivery Controller, you can specify that all printers be created before the app is started

The following command will make the VDA Login not to wait for printer creation

The following command will make the VDA login, to wait for printer creation

Drag and then drop files between a Citrix session and a local endpoint (for evaluation only)

Dragging and then dropping files between a Citrix session and a local endpoint is available for evaluation. You can drag and then drop files, groups of files, directories, groups of directories, or a combination of files and directories to and the same client on the session. This ability applies to a desktop session or a seamless app. This includes the desktop, Explorer window, and some applications. This feature does not support all apps. For example, you can drag a file out of a compressed (zipped) folder, but not into one.

IMPORTANT:

The feature requires a minimum of Citrix Workspace app 2002 for Windows. This feature is included for customer evaluation only and is disabled by default.

Some known limitations:

You cannot drag a file from a client desktop into a Firefox or Internet Explorer browser window inside a desktop session.

You cannot drag and then drop into a zipped folder, into an application shortcut, a message from a seamless application to a client desktop, or into a seamless Outlook message if dragged quickly from a client.

To enable drag-and-drop, make the following registry setting on the host:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CtxDNDSvc\

Name: Enabled

Type: REG_DWORD

Value: non-zero

After you enable the registry value, and if using the required Citrix Workspace app version, drag-and-drop is enabled after the next session logon.

Loss tolerant mode

IMPORTANT:

The feature requires a minimum of Citrix Workspace app 2002 for Windows. This version of the VDA will support it when it becomes available.

Loss tolerant mode uses a new transport protocol to enhance the user experience in challenging network conditions

Loss tolerant mode enhances the user experience for users connecting through networks with high latency and packet loss. It accomplishes this by using the EDT Lossy transport protocol.

Initially, sessions are established using EDT. If the latency and packet loss thresholds are reached or surpassed, the applicable virtual channels switch from EDT to EDT Lossy, while leaving the other virtual channels on EDT. If the latency and packet loss decrease below the thresholds, the applicable virtual channels switch back to EDT.

The default thresholds are:

Packet loss: 5%

Latency: 300ms (RTT)

Loss tolerant mode is enabled by default and can be disabled using the loss tolerant mode setting. Adjust the packet loss and latency thresholds using the loss tolerant mode thresholds setting.

Requirements:

  • Citrix Virtual Delivery Agent (VDA) 2003
  • Citrix Workspace app 2002 for Windows
  • Session reliability enabled

https://support.citrix.com/article/CTX270592

Upgrade: Effects of changes in supported SQL Server versions

Changes in supported database versions can affect Citrix upgrades. Site databases: SQL Server 2008 R2, 2012, and 2014 are no longer supported for the site database. (This includes the monitor and configuration logging databases.) Local host cache database: SQL Server version 2014 is no longer supported for the local host cache database

Install and upgrade: Personal vDisk install and upgrade no longer allowed

The Personal vDisk (PvD) component can no longer be installed or upgraded. PvD no longer appears in the VDA installers’ graphical interface. From the command line, including the /baseimage option causes the command to fail. The installation media no longer contains the PvD software.

Install and upgrade: Windows Server 2012 R2 no longer supported for Controllers, Studio, Director, VDAs, and Universal Print Server

You can no longer install or upgrade Delivery Controllers, Studio, Director, VDAs, or the Universal Print Server on Windows Server 2012 R2 machines

Install and upgrade: 32-bit Studio installer no longer available on installation media

The Citrix Virtual Apps and Desktops installation media no longer contains the 32-bit Studio installer.

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