I wan't to share this .net BUG:

You may receive any of the following error messages: 

OleDbException (0x80004005): [DBNETLIB][ConnectionOpen (Connect()).]SQL
Server does not exist or access denied.] 
-or- 
SqlException (0x80004005): [DBNETLIB][ConnectionOpen (Connect()).]SQL Server
does not exist or access denied.] 
-or- 
System.Data.SqlClient.SqlException: SQL Server does not exist or access
denied 
-or- 
System.Data.OleDbClient.OleDbException: SQL Server does not exist or access
denied

Microsoft Knowledge Base Article - 315159

	
Greets, J.P.