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Windows XP Clients Cannot Connect to a Windows 2000 Terminal Services Server
Article ID: 323597 - View products that this article applies to.
This article was previously published under Q323597
NoticeThis article applies to Windows 2000. Support for Windows 2000 ends on July 13, 2010. The Windows 2000 End-of-Support Solution Center
(http://support.microsoft.com/?scid=http%3a%2f%2fsupport.microsoft.com%2fwin2000)is a starting point for planning your migration strategy from Windows 2000. For more information see the Microsoft Support Lifecycle Policy
When you try to connect from a Windows XP-based client to a Windows 2000-based Terminal Services server, the connection may not succeed and you may receive the following error message:
This error message may occur when you try to connect from a Windows XP-based client to some or all of the Windows 2000-based Terminal Services servers in your organization, or the error message may not occur at all.
Because of a security error, the client could not connect to the terminal server. After making sure that you are logged on to the network, try connecting to the server again.
When you try to connect from a Windows 2000-based client to a Windows 2000-based Terminal Services server, the following error may be logged on the Windows 2000 Teminal Server:
Event ID: 1003
The terminal service client has provided an invalid license.
This error message is caused by a change in the certificates that are used by the Microsoft Clearinghouse to authorize Terminal Services Licensing servers.
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:
(http://support.microsoft.com/kb/322756/ )How to back up and restore the registry in Windows
To resolve this problem, follow the steps in the following section on the affected Windows 2000-based Terminal Services servers and the Windows XP-based clients.
On the Terminal Services Server
On the Windows XP-Based Client
Because Windows XP Professional-based clients have a built-in Terminal Services Client Access License (CAL) for accessing Windows 2000-based Terminal Services servers, deleting the MSLicensing key on the client does not adversely affect license allocation in an organization.