in such cases the issue is usually an incorrect database detail (e.g. the sql server is using a different instance name) or if it is remote then it has not been enabled for remote connections. My recommendation is these circumstances is to remove DNN from the equation and please try creating a udl file (http://msdn.microsoft.com/en-us/libra...) and testing that - they often reveal better exceptions (such as sql connections not supporting remote connections etc.). If you can create one and connect, open the udl file in notepad and you'll see the connection string you need.

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