Citrix, XenApp

XenApp 7.X Architecture and Sizing

Dell’s solutions engineering team just posted an extensive refresh of their XenApp recommendation for their Citrix solution architecture.  The post includes sections on architecture, use cases, optimization and configuration recommendations.

Dell and Citrix have a long history of working together to develop joint desktop virtualization solutions and this is another great example of the work that comes from our alliance.  Thanks to Peter Fine, Dell Solution Engineer, for the work his team does to drive optimized solutions for Citrix on Dell platforms.


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Blog, Citrix, XenCenter, XenServer

How to increase Virtual Machine disk space on a XenServer via XenCenter?

I thought to post this simple task, because I came across to teach it for a fresh Citrix admin how to do it.

This is a simple task via GUI, but not so automatic as in e.g. VMware vCenter. Basically, you have to finish expand new size of disk via Windows Disk Management. Before you begin you should always take a snapshot of your virtual machine.

Applicable products: Windows Server 2008 R2, XenCenter 6.2


<Click pictures to zoom full details>

1. Shutdown virtual machine

2. Take a snapshot

3. In XenCenter choose virtual machine which disk need to be increased -> Storage -> Properties -> Size and location


4. Set new size of disk

5. Start virtual machine

6. Log in and choose Computer -> Right click -> Choose Manage -> Disk Management -> Storage


7. Right click on the disk you want to extend, and select Extend


8. Click Next


9. Click Next


10. Click Finish


11. And you’re done!





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Citrix, Course, Education, XenApp

Citrix XenApp 7.5 Architecture and New Features – free online course

Citrix XenApp 7.5 Architecture and New Features

This course introduces the Citrix XenApp 7.5 technology. Students will explore the key components required in a XenApp 7.5 implementation, the new FMA-based architecture, as well as key use cases. Other topics covered include design implications, VDA registration and Hybrid Cloud Provisioning.






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Citrix, Citrix TV, News, XenMobile

XenMobile 8.7 Shared Devices Configuration



In this series of 2 videos you will learn how to configure XenMobile Device Manger to support shared devices and how to configure the policies for users and enrollment admin.

Learn how to configure XenMobile 8.7 Shared Devices feature and enable the enterprise users to share devices receiving only the applications related to his function in the company. Once that user sign off the device will become available for the next user to sign on…

Part 1-2:

XenMobile 8.7 Shared Devices Configuration Part 2-2 shows the difference in Deployment package policies process to be assign to users groups and enrollment admin.

Part 2-2:


Published by Albert Alvarez on 17 Mar 2014 at




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Adobe Flash, Blog, Citrix, Receiver, VDA, VDI, Windows, XenDesktop

How to get Citrix XenDesktop VDI and HDX MediaStream Flash Redirection on the User Device work?

Configuring HDX MediaStream Flash Redirection

HDX MediaStream Flash Redirection allows you to move the processing of most Adobe Flash content to LAN-connected user’s Windows devices rather than using server resources. This includes animations, videos, and applications. By moving the processing to the user device, Flash Redirection reduces server and network load, resulting in greater scalability while ensuring a high definition user experience.

Recently, I came across a situation where the Citrix HDX MediaStream and Client-Side Flash redirection did not work. Here are a few things to consider, however these are the latest version today, things may change when the vendors update their product versions in future.

Environment details, versions may vary but you could find interesting spots from this blog to narrow down your own Flash problems:

XenDesktop 5.6

VDA 5.6.200
Windows 7 64-bit
Internet Explorer 10
ActiveX Flash Player

Windows 7 32-bit
Citrix Receiver 4.1
ActiveX Flash Player


Situation was that when users browse web sites including Adobe Flash content e.g. YouTube, Flash was rendered on the Server-Side, though XenDesktop default policy is set to use Client-Side rendering for the flash contents by default.

It generated lot of vCPU load on the virtual servers and video was choppy and audio was not synchronized. This can have a huge impact on users, depending on the size of the infrastructure.

How to get XenDesktop VDI and Adobe Flash Client-Side redirection to work?

First thing was the update latest Flash version, which is today Adobe Flash ActiveX version for the Internet Explorer. Same version needs to be installed on the client device as well. Be aware, that Internet Explorer is the only browser which use ActiveX player, as for the other browser e.g. Google Chrome or Mozilla Firefox Adobe Flash Plug-In needs to be installed. But in this blog I will only focus on the Internet Explorer 10 and Windows 7 64-bit VDI.

Adobe Flash Player archive source – all versions:

You can make sure of installed Flash players version to launch Flash Player tool -> Advanced from the Windows Control Panel.

This should normally be enough to get Client-Side Flash rendering to work, but if it’s not working, we might have a problem.

The next thing was to check Virtual Desktop Agent (VDA) version and update it, if necessary. I found out that there was a newer version, which could possibly solve my issues.

As the environment was XenDesktop 5.6 Desktop Delivery Controllers, latest VDA agent was:

Hotfix Rollup XD560VDAWX64400 (Version 5.6.400) – For Citrix XenDesktop Virtual Desktop Agent Core Services x64 – English

or if you have 32-bit VDI

Hotfix Rollup XD560VDAWX86400 (Version 5.6.400) – For Citrix XenDesktop Virtual Desktop Agent Core Services x86 – English


After that I realized we have to check Citrix Receiver version on the client device too, I found out there are some problems between Receiver 3.4 and 4.1 versions with VDA 5.6 (depending exact versions of course), so as I know latest working versions was the Citrix Receiver 3.3 and the latest 4.1 ( You can download Citrix Receiver 4.1 from there:

Citrix Receiver for Windows 4.1 (

If you need to Single Sign-On (SSON) enabled, remember to use command: “CitrixReceiver.exe /includeSSON”


Now we have all client and plugin versions up-to-date on the Client machine and on the VDI Image, but we still need to configure some policies to get it work, even as I said before Flash Client-Side redirection should work by default, in some cases it does not work.

Use this checklist:

Use Citrix HDX Monitor to narrow down any issues, it shows easily what is wrong:
Check Internet Explorer 10 – Citrix Known Issues

In the VDI machine, you might need to add registry setting for the Internet Explorer 10


“IEBrowserMaximumMajorVersion” = dword:0000000a

(use hexadecimal 00000010 for the IE version 10)


Enable XenDesktop policies:

Flash Acceleration -> Enabled


Enable Active Directory Group Policies:

To configure HDX MediaStream Flash Redirection on the User Device with Group Policy Objects

Create or select an existing Group Policy Object.

Import and add the HDX MediaStream for Flash – Client administrative template (HdxFlash-Client.adm), available in:

– For 32-bit computers: %Program Files%\Citrix\ICA Client\Configuration\language.
– For 64-bit computers: %Program Files (x86)%\Citrix\ICA Client\Configuration\language.


To enable HDX MediaStream Flash Redirection on the user device:

Configure Enable HDX MediaStream for Flash on the user device to determine whether Flash Redirection is enabled on your users’ Windows devices. If no configuration is set, one of the following will occur, based on your users’ environment:

– XenDesktop Viewer is used: Flash Redirection is disabled by default.
– XenDesktop Viewer is not used: The user receives a dialog box the first time they access Flash content in each session in which the user can enable HDX MediaStream Flash Redirection.
– Locked Desktop Appliance is used: Flash Redirection is enabled by default.

1. In the Group Policy Object Editor, expand either the Computer Configuration or User Configuration node.
2. Expand the Administrative Templates and Classic Administrative Templates (ADM) nodes and select HDX MediaStream for Flash – Client.
3. From the Setting list, select Enable HDX MediaStream for Flash on the user device and click policy setting.
4. Select Not Configured, Enabled, or Disabled.
5. If you selected Enabled, from the Use HDX MediaStream for Flash list, select Always, Ask, or Never.

Note: Selecting Ask results in users receiving a dialog box the first time they access Flash content in each session in which the user can enable HDX MediaStream Flash Redirection. If the user does not enable HDX MediaStream Flash Redirection, the Flash content is played on the server. Selecting Always and Never do not result in this dialog box. Select Always to always use HDX MediaStream Flash Redirection to play Flash content on the user device. Select Never to never use HDX MediaStream Flash Redirection and have Flash content play on the server.

6. For the policy to take effect:

– Computer Configuration: Changes take effect as computers in the organizational unit restart.
– User Configuration: Users in the organizational unit must log off and then log on to the network.


Test it and now your Adobe Flash Client-Side direction should work!





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