Here is a post with a similar error message: http://stackoverflow.com/questions/8150737/asp-net-mvc3-connection-string-keyword-not-supported-initial-catalog
In their case it was the data provider that was the problem. t would think that that is also the case here:
-First see if adding 'providerName="System.Data.SqlClient" to your connection string solves your problem.
-Secondly try changing the data provider from 'ADO.NET' to "Ado.Net" (although from what I remember case does not matter).
Hope this gets you going.
Jack Poorte, Feb 11, 2014