Citrix: Export to network drive really slow

For one of our customers I was asked to troubleshoot an application that exports data to several file types, including Microsoft Excel’s XLS file type.


The client runs Citrix XenApp 5 on Windows Server 2003 (x86). All user homedrives are mapped to the H-drive.


The application lets you perform queries on your Oracle database, analyze and format the results and prepare those for presentation. When the application exports an XLS-file to the H-drive, it freezes for 5 minutes and then responds normally again. However, when the same application exports a TXT- or CSV-file to the same drive, it freezes for just a few seconds.

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Application causes Screen Flickering in Citrix XenApp Session

Yesterday I was asked to troubleshoot an interesting issue with an application running on Citrix XenApp.

This customer is running Citrix XenApp 5 on Windows Server 2003 (x86). On the Client Side the Online Plugin version 12.3 is used.

The Problem
When this particular application was active the screen was flickering and black blocks appeared at seemingly random places. Further more it was not possible to resize the window:


My experience is that display issues are often related to either HDX Flash Redirection (offloading flash to the client) or the Multi Monitor hook.


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Application Hangs when Scanning in Citrix XenApp

Another interesting issue today with an application that runs on Citrix XenApp.

Customer has a Citrix XenApp 5 environment running on Windows Server 2003. Clients are all Windows XP and run the Citrix Online Plugin 12.3 full screen.

RES Workspace Extender is used to integrate locally installed application into the XenApp Session. Users have no access to the local desktop.

This particular application scans invoices using a USB scanner attached to the client and runs them trough a workflow.
Whenever the Start scan button was pressed the application froze.



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License Check fails on Citrix XenApp

imageA while ago I was asked to assist in getting an Excel Add-In to work on Citrix XenApp.

The application was packaged into a Thinapp by one of our package engineers.

However when testing the Add-In on Citrix XenApp the following message appeared:


Apparently this application does a license check that fails when run from another server (how bad).

Before we go on: I would like to make clear that my goal is not to be able to use an application without license. I am just trying to make it work within the customer’s environment.

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Windows 2012 VM on XenServer error

Today I want to install an Windows 2012 VM on my XenServer home lab environment. So I created the VM. Inserted the Windows 2012 ISO in VM. I start the VM. After loading of the Windows files I see the following error.

Your PC needs to restart.
Please hold down the power button.
Error Code 0x0000005D

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Troubleshooting example with RES Workspace Manager

Today I am helping an IT department with troubleshooting on a Citrix XenApp environment that is managed trough RES Workspace Manager.

The call I receive is that a user complains that when he opens an attachment in Outlook it appears automatically in his ‘My Documents’ folder and then disappears when the attachment is closed.

This behavior is caused by a registry key called OutlookSecureTempFolder under HKey_Current_User\Software\Microsoft\Office\Version\Outlook\Security

In this environment there is a long list of registry files and policy’s that is loaded at user login. The next step is to find out which registry file or policy is responsible for adding a value to the above mentioned registry key.

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Citrix XenCenter crashes with error 0xc000007b

Author: Ingmar Verheij

After launching Citrix XenCenter if crashed with error 0xc00007b and exited immediately. Although my work laptop is really in need of some TLC – it needs a clean install, I preferred troubleshooting the issue.

A quick trace with Sysinternals Process Monitor showed a dynamic link library (DLL) being loaded that I didn’t expect: Airfoilinject3.dll.

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32bpp in XenServer virtual machine

Author: Ingmar Verheij

Recently I had to setup a virtual machine on a Citrix XenServer host that could use 32bpp. This turned out harder than I thought because the default video adapter in a Xen virtual machine is a Cirrus with 4MB, and that video card is not capable of 32bpp.

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Cookie Error on Citrix XenApp

A user reported that the following error while visiting a website on a Citrix XenApp server:

You must have cookies enabled in order to user this tool. Please reload the page and try again.

I tried adding the site to the Trusted Sites List and adding the url to the Per Site Privacy list:


But this didn’t work, but I noticed that the site was “flickering” a lot so I suspected that HDX Flash Acceleration was the problem.

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Event 5001, xennet6 after installing XenTools

Author : Ingmar Verheij

After installing the XenTools (version on a Windows Server 2008 R2 virtual machine, hosted on a Citrix XenServer 6.0 (build 50762p), the network connectivity degraded. Although I could connect to the machine via RDP the provisioning server was marked Down and XenDeskop services terminated unexpectedly.

As a workaround you can disable IPv6 on the network connections where you don’t use IPv6. After a reboot you can enable IPv6 again, the xennet6 error will remain but both PVS and XenDesktop worked fine.

If disabling IPv6 doesn’t work you can install XenTools 5.6 SP2, but I would try to keep it as a last resort. More information about the issue can be found on Citrix Forums.

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