Microsoft states in their article: 901150

You may receive a “Stop 0x000000ab” error message when you log off a Terminal Services session on a Windows Server 2003 SP1-based Terminal Server
View products that this article applies to.
Article ID : 901150
Last Review : April 28, 2006
Revision : 3.1
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SYMPTOMS SYMPTOMS
CAUSE CAUSE
RESOLUTION RESOLUTION
Hotfix information Hotfix information
Prerequisites Prerequisites
Restart requirement Restart requirement
Hotfix replacement information Hotfix replacement information
File information File information
Windows Server 2003, x86-based versions Windows Server 2003, x86-based versions
Windows Server 2003, x64-based versions Windows Server 2003, x64-based versions
Windows Server 2003, Itanium-based versions Windows Server 2003, Itanium-based versions
WORKAROUND WORKAROUND
STATUS STATUS
REFERENCES REFERENCES
APPLIES TO APPLIES TO
SYMPTOMS
When you log off a Terminal Services session on a Microsoft Windows Server 2003 Service Pack 1 (SP1)-based Terminal Server, you may receive the following error message:
Stop 0x000000ab
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CAUSE
This problem occurs when the following conditions are true:
• A font object is not correctly installed on the Windows Server 2003 SP1-based Terminal Server.
• You remove the font object.
• The associated data of the font object is not removed from the computer's memory.
• A memory leak occurs. This memory leak causes the computer to generate the error message.
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RESOLUTION
Hotfix information
This hotfix is replaced by hotfix 910362.

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:
http://support.microsoft.com/contactus/?ws=support (http://support.microsoft.com/contactus/?ws=support)
Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.
Prerequisites
To apply this hotfix to Itanium-based versions of Windows Server 2003 or to x86-based versions of Windows Server 2003, you must have Windows Server 2003 SP1 installed on your 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.
Windows Server 2003, x86-based versions

Date Time Version Size File name
--------------------------------------------------------------
23-Jun-2005 01:10 5.2.3790.2472 1,847,808 Win32k.sys
05-Mar-2005 01:30 6.1.22.4 371,936 Updspapi.dll

Windows Server 2003, x64-based versions

Date Time Version Size File name
--------------------------------------------------------------
23-Jun-2005 01:56 5.2.3790.2472 4,517,376 Win32k.sys
23-Jun-2005 01:56 6.1.22.4 462,560 Updspapi.dll

Windows Server 2003, Itanium-based versions

Date Time Version Size File name
--------------------------------------------------------------
23-Jun-2005 01:56 5.2.3790.2472 5,545,472 Win32k.sys
23-Jun-2005 01:56 6.1.22.4 639,712 Updspapi.dll

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WORKAROUND
To work around this problem, remove Windows Server 2003 Service Pack 1 (SP1) from the computer.

Important Do not complete this workaround if you require the functionality that Windows Server 2003 SP1 provides.
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STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
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REFERENCES
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
907242 (http://support.microsoft.com/kb/907242/) You receive a "Stop 0x000000ab" error message when you log off from a Terminal Services session on a Windows Server 2003 S-based Terminal Server
For more information about standard terminology that is used to describe Microsoft software updates, click the following article number to view the article in the Microsoft Knowledge Base:
824684 (http://support.microsoft.com/kb/824684/) Description of the standard terminology that is used to describe Microsoft software updates
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APPLIES TO
• Microsoft Windows Server 2003, Datacenter Edition for Itanium-Based Systems
• Microsoft Windows Server 2003, Datacenter x64 Edition
• Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
• Microsoft Windows Server 2003, Enterprise Edition for Itanium-based Systems
• Microsoft Windows Server 2003, Enterprise x64 Edition
• Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
• Microsoft Windows Server 2003, Standard x64 Edition
• Microsoft Windows Server 2003, Standard Edition (32-bit x86)
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Keywords:
kbbug kbfix kbqfe kbmsccsearch kbpubtypekc kbwinserv2003sp1fix KB901150
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