External exception C0000006 – Windows 2008 Terminal Server

With applications which start from a network share on a Windows 2008 Terminal Server , the error “External exception C0000006” can occur.
This is a known problem when multiple users start the same executable  from a network share.

To fixes this problem you need to add a reg setting.

Subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MRxSmb\Parameters

Entry: MultiUserEnabled
Value: 1

External exception C0000006


Programs that are run from a network share on Terminal Services close or generate errors

Problems when more than one user accesses the same file through Terminal Services

IGEL – How to configure a RDP or ICA Session that shuts down IGEL after session has ended

1. Setting up an RDP Session.
2. Setting up a “Locale Shell/Application” IGEL Setup -> Accessories -> Terminals.
3. Configuring in IGEL Setup -> System -> Registry ->  sessions -> xterm0 -> cmdline the following entry:
/config/sessions/winconnect0 ; /sbin/user_shutdown -f
4. From now on don´t start the RDP session, but the local Shell.
For some reasons it could be useful to change the Name and the Icon of the local Shell:
5. Change the Parameter “sessions.xterm0.Icon” to winconnect.
6. Change name of “sessions.xterm0.Session Name” to “RDP Session” or something like this.

To complete it, you should configure in Setup the RDP Session that this Session should not be added to the start menu or on the Desktop/Application Launcher.

Of course xterm0 or winconnect0 is changed to xterm1-…or winconnect1-…, if the Session is not the first session on the Thin Client.

For the autostart Go to IGEL Setup -> Accessories -> Terminals -> Local Terminal and turn on the Autostart Checkbox.

This works for an ICA Session too. Change every “winconnect0” in this FAQ to “ica0”

This works only on Linux based IGEL devices.

Popup in IE after installing Hotfix XA650W2K8R2X64025 and HDXFlash200WX64001 for XenApp 6.5

I noticed in some environments that after installing XA650W2K8R2X64025 and HDXFlash200WX64001 for XenApp 6.5 (wich fixes a lot of flash redirection issues in XA65) the users are getting an popup in Internet Explorer about the VDAredirector.exe opening outside IE protected mode :

(Screenshot is from a user with the Dutch language pack enabled)

English message :

This program will open outside of Protected mode. Internet Explorer’s Protected mode helps protect your computer. If you do not trust this website, do not open this program.

Name: Citrix FTA, URL VDA Redirector
Publisher: Citrix Systems, INC

Resolution :

After selecting “Do not show me the warning for this program again” and clicking on “Allow” i searched the registry and found the following key :

[HKCU\Software\Microsoft\Internet Explorer\Low Rights\ElevationPolicy\{BFFC40A2-FFE2-4E6F-B179-3641561D4FCD}]
“AppPath”=”C:\\Program Files (x86)\\Citrix\\system32″

Import this registry key into RES Workspace Manager (loginscript or other environment manager software you are using) apply it to your users and they will not be bothered with this warning message!

Source : http://bramwolfs.com/tag/vda-redirector/

Allowing Citrix Receiver 3.1 to use HTTP as well as HTTPS



There does not seem to be a way to allow HTTP in the GUI or the ADM but it can be done in the registry.

  • Open Regedit
  • Navigate to HKLM\SOFTWARE\Citrix\AuthManager on a 32-bit machine or HKLM\SOFTWARE\Wow6432Node\Citrix\AuthManager on a 64-bit machine
  • Under AuthManager create a new String Value (Reg_SZ) with the name ConnectionSecurityMode and the Data Any

  • Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Citrix\Dazzle on a 32-bit machine or HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Citrix\Dazzle on a 64-bit machine
  • Under Dazzle modify the data of AllowAddStore to be A

  • Exit Citrix Receiver and restart it.

Print on local in a Citrix Session using Ubuntu 10.10

To add you local printer in your Citrix Session edit the following file


Under the section WFClient add the following lines

DefaultPrinter = (here use the cups printer name for the printer you want)
DefaultPrinterDriver = Citrix PCL 4 Universal Driver

You have not chosen to trust “AddTrust External CA Root”, the issuer of the server’s security certificate.

After installing the latest Citrix Client on my Ubuntu 10.10 laptop I wanted to log in a a Citrix Portal.

I got the following error.

You have not chosen to trust "AddTrust External CA Root", the issuer of the server's security certificate.

This solved my problem:

sudo cp /usr/share/ca-certificates/mozilla/*.* /usr/lib/ICAClient/keystore/cacerts/

Installing Citrix Client on Ubuntu 9.10

Install OpenMotif

sudo aptitude install libmotif3

Unfortunately, Ubuntu only provide the obsolete libmotif3 version and the not the current version 4 that the receiver is built against.
The easiest solution is to install libmotif3 and then run

sudo ln -s /usr/lib/libXm.so.3.0.2 /usr/lib/libXm.so.4

Download the latest Citrix Client from:
Search Downloads by Product > Citrix Xenapp > Linux Client
Version 11.0 English German Japanese 3/2/09 2.1 mb .deb
x86 client – requires OpenMotif v.2.3.1
Install the .deb with GDebi.