Citrix MetaFrame XP or Citrix MetaFrame Presentation Server 3.0 do not work as expected after you install Update Rollup 1 on a Windows 2000 SP4-based server

Consider the following scenario. You have either of the following products installed on a Microsoft Windows 2000 Service Pack 4 (SP4)-based server:

• Citrix MetaFrame XP Server for Windows with Feature Release 3 (FR3)
• Citrix MetaFrame Presentation Server 3.0

You install Update Rollup 1 for Windows 2000 SP4 on this Windows 2000 SP4-based server. After you install the update rollup, you use the Citrix Independent Computing Architecture (ICA) Client program on a client computer to establish a connection with the Windows 2000-based server. You then try to run a published program on this server.

In this scenario, when you establish the connection with the Windows 2000-based server, you notice that you cannot run the published program. Additionally, you are not prompted to enter the user logon credentials. Subsequently, the client computer becomes unresponsive and you have to end the ICA Client session.

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, you must have Windows 2000 Service Pack 4 (SP4) installed on the computer.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:

To work around this problem, follow these steps:

1. Click Start, click Run, type regedit, and then click OK.
2. In Registry Editor, locate and click the following registry subkey:
   HKEY_LOCAL_MACHINE\Software\Citrix\Ctxhook\AppInit_Dlls\Smart Card Hook
3. In the right-pane, locate and double-click the FilePathName registry entry.
4. In the Value data box, locate and rename scardhook.dll to scardhook.dll.old.
5. Quit Registry Editor.
6. Restart the computer.

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

For more information about other Citrix MetaFrame related issues, click the following article number to view the article in the Microsoft Knowledge Base: For more information about the standard terminology that is used to describe Microsoft software updates, click the following article number to view the article in the Microsoft Knowledge Base: The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.