Error message when an application connects to SQL Server on a server that is running Windows Server 2003: "General Network error," "Communication link failure," or "A transport-level error"
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Product: Microsoft SQL Server 2005 Enterprise Edition & SQL Server 2005 Standard Edition
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Error message when an application connects to SQL Server on a server that is running Windows Server 2003: "General Network error," "Communication link failure," or "A transport-level error"
http://support.microsoft.com/kb/942861/en-US