Knowledgebase: DotNetNuke
Instance Failure MSSQL Server in C# ASP.NET - DotNetNuke
Posted by on 23 February 2013 04:58 PM

Check your web.config file for the following:

connectionString="Data Source=.\\SQLSERVER;Initial Catalog=Northwind_db_;Integrated Security=True"
The problem is "Data Source=.\\SQLSERVER;" - It's the double \\. That's an escape sequence in C#. Switch the connection string to .\SQLSERVER.
If this is not the case please check to make sure that your SQL Server Service is running.
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