Microsoft states in their article: 323478

You cannot debug through a Terminal Server session
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Article ID : 323478
Last Review : April 28, 2006
Revision : 2.1
This article was previously published under Q323478
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SYMPTOMS SYMPTOMS
CAUSE CAUSE
RESOLUTION RESOLUTION
To use the Task Manager To use the Task Manager
To use the AT.exe utility To use the AT.exe utility
STATUS STATUS
APPLIES TO APPLIES TO
SYMPTOMS
When you try to attach a native debugger over Terminal Services to a process that runs in another WinStation (including system processes), you receive the following error message:
Win32 error 5
"Access is denied."
Also, if you run AutoDump+ (which scripts the cdb.exe debugger) in -crash mode, you receive an error message similar to the following:
Autodump+ has detected that you are attempting to run in "Crash" mode, but this account is currently logged into terminal server session ID:RDP-TCP#8. "Crash" mode (invoked via the -crash switch) does not work inside a terminal server session. To run Autodump+ in "Crash" mode, please log in locally at the console.
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CAUSE
The debugger cannot attach to a process that runs in another WinStation.
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RESOLUTION
To work around this problem, you can attach noninvasively by using the -pv switch. Alternatively, you can schedule a task remotely by using the Task Manager or the AT.exe utility. You can either schedule the debugger to run, or you can schedule a remoted Cmd window.
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To use the Task Manager
1. Start Windows Explorer, and then locate \\remotemachinename.
2. Double-click the Scheduled Tasks icon.
3. On the File menu, click New, and then click Scheduled Task.
4. Give the new task a name, and then double-click the task to set the properties.
5. In the Run box, type one of the taskcommands described below.
6. On the Schedule tab, set the time for the task to start.

NOTE: Make sure you give a username and a password when you are prompted.
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To use the AT.exe utility
1. From the command prompt, type:

at.exe \\remotemachinename 12:00 taskcommand
2. Replace 12:00 with the time to start the task.
3. Replace taskcommand with one of the taskcommands below:
• To start your debugger directly (for example, adplus in -crash mode):

• c:\winnt\system32\cscript.exe "c:\program files\debugging tools for windows\adplus.vbs" -crash -iis -quiet

NOTE: When you start adplus.vbs remotely, remember to use the -quiet switch and to check the .log file for status.
• To start a remoted Cmd window:

• "c:\program files\debugging tools for windows\remote.exe" /s cmd myremotedcmd
• To connect from the client, you can run remote /c remotemachinename "myremotedcmd".
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STATUS
This behavior is by design.
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APPLIES TO
• Microsoft Windows NT Server 4.0, Terminal Server Edition
• Microsoft Windows 2000 Standard Edition
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Keywords:
kbprb KB323478