Hi Luis,

Check if this thread http://forums.asp.net/p/1382439/2933882.aspx#2933882 can be of some help.

>Hello
>I installed the SQL Server adn when i want to connect to the database by the Windows authentication,
>I sure that i put the server name correctly, the server type is Database Engine
>The errror message said:
>
>TITLE: Connect to Server
>------------------------------
>
>Cannot connect to pc.
>
>------------------------------
>ADDITIONAL INFORMATION:
>
>An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 2)
>
>For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&EvtSrc=MSSQLServer&EvtID=2&LinkId=20476
>
>
>I will appreciate the help you can give to me
>Luis