You may receive an error message when a SQL Server 2005 client requests encryption and connects to 127.0.0.1 on a Windows XP-based computer
The following pages were recently modified.
Source: Knowledge Base
Product: Microsoft SQL Server 2005 Enterprise Edition, SQL Server 2005 Standard Edition & SQL Server 2005 Enterprise X64 Edition
Notification Contents: New and Major Modifications
You may receive an error message when a SQL Server 2005 client requests encryption and connects to 127.0.0.1 on a Windows XP-based computer
http://support.microsoft.com/kb/916782/en-US