We have found that for some customers, they experience a terminal login to Windows problem after installing NComputing software version NCT 4.03.094. We have also found a workaround for this until this is corrected in our next software release. This can be referenced as a "winlogon" error.

The symptom for this problem is: The L-device user attempts to log in to host PC with the L-terminal, and after seeing the Windows user login screen, and after entering their Windows login credentials, instead of logging into Windows, the terminal returns the user to the L-terminal Server Selection screen without presenting any error screen. On the host PC NConsole, the terminal status may briefly show "winlogon" error.

This problem seems to occur with users who are installing version 4.03.094 (v94 for short), of the NComputing NCT-2000-XP software for the first time, or if they are upgrading from the software found on the driver CD, 4.03.084 (or v84).

Overview
Winlogon failure is an issue that has arisen in recent NComputing software releases, including NCT versions 91 and 94. This issue can appear in any Windows system that is part of a domain, following the installation or update of NCT software. This issue manifests differently depending on what product you are using, but appears to arise from the same root cause.

Solutions
There are multiple solutions available for this issue, which have been divided into two categories. All of the solutions require that any existing installations of NComputing terminal services software be removed, though deciding which solution will work best in a given environment is, of course, entirely up to the customer.

The first category of solutions is the "Domain Cycle" group.
For Windows XP SP2 or SP3 users
Note: For Windows XP SP3 users unwilling to remove their PC from the domain, please contact Technical Support for additional workaround options.
This solution requires that you install the NComputing software on a machine while it is not part of the domain. On new installations, this would simply require that you install the software prior to adding the PC to the domain. On existing deployments, you will need to remove the computer from the domain, install the NComputing software, and add it back to the domain.

The second category of solutions is the "Downgrade-Upgrade" group,
For Windows XP SP2 users only
This solution is applicable for XP SP2 customers who are unwilling to remove their Host PCs from the domain. This solution involves installing a previous (non-SP3-compatible) version of the NComputing software, and then updating to the latest version again, if desired. This works best on XP SP2 systems.
For specific solution steps, please scroll to the appropriate guide below.

Software Downloads
These solutions use several different versions of the NComputing terminal services software. Here are download links corresponding to each version:
• NCT v90 - www.ncomputing.com/download/L230_r090.3.zip
• NCT v94 - www.ncomputing.com/download/L230.zip

L-Series Domain Cycle Solution

To eliminate the Winlogon Failure bug in L-Series NComputing access terminals, please take the following steps.

For a Host PC that is not yet a member of network domain:
As a simple preventative installation practice, install the NCT software on your NComputing host computers prior to adding them to the domain. If you do this, then you will not have to perform the below steps.

For a Host PC already added to a network domain:
(Note: The following solution involves removing your NCT host from a domain; please check with your network administrator before proceeding):

1) Remove Existing NComputing Software
• If NCT-2000-XP is already installed, uninstall it from the system
• Reboot your computer.

2) Remove Host PC from Domain
• Right-click "My Computer" and select "Properties"
• Click the "Computer Name" tab
• Click "Change"
• Click the "Workgroup" bullet and enter "WORKGROUP" as the workgroup name.
• Restart your computer to save the changes.

3) Reinstall NComputing Software
• Download and unzip software version 94:
http://www.ncomputing.com/download/L230_v94.zip
• Run setupnc.exe.
• Restart your computer.
• Confirm that your terminals can login successfully.

4) Add to Domain
• Right-click "My Computer" and open "Properties" again
• Click the "Computer Name" tab
• Click "Change"
• Return your computer to the domain (if you do not know the domain name or the necessary credentials, please consult your network administrator)
• Restart your computer to save the changes.



L-Series Downgrade-Upgrade Solution

To eliminate the Winlogon Failure bug in L-Series NComputing access terminals, please take the following steps (Note: this solution is not applicable for XP SP3 systems):

1) Remove Existing NComputing Software
• If NCT-2000-XP is already installed, uninstall it from the system.
• Restart your computer.

2) Install "Downgrade" Version
• Download and unzip the L-series version 90 software:
http://www.ncomputing.com/download/L230_r090.3.zip
• Run "setupnc.exe"
• After the installation completes, restart your computer.
• Attempt logging in on the terminal to confirm that the issue was resolved.

3) If Desired, Update to Latest Version
• If desired, you can now update successfully to version 94 by:
1) Download and unzip software version 94:
http://www.ncomputing.com/download/L230_v94_update.zip
2) Running the L230_v94_update.exe
(Note: One or more serial numbers must be registered to enable updates).