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Editorial Team
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Asked: 2026-06-10T19:15:34+00:00

I am using EF Code First (.NET 4.5 + VS2012). My project was creating

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I am using EF Code First (.NET 4.5 + VS2012). My project was creating and using LocalDB correctly. I have SQL Server Express also installed on my machine (2008R2). I didn’t change any configuration yet it switched to using SQL Server Express.

I have now stopped my SQL Server instance and whenever I try to rebuild the database using Update-Database I get the following message:

System.Data.ProviderIncompatibleException: An error occurred while
getting provider information from the database. This can be caused by
Entity Framework using an incorrect connection string. Check the inner
exceptions for details and ensure that the connection string is
correct. —> System.Data.ProviderIncompatibleException: The provider
did not return a ProviderManifestToken string. —>
System.Data.SqlClient.SqlException: A network-related or
instance-specific error occurred while establishing a connection to
SQL Server. The server was not found or was not accessible. Verify
that the instance name is correct and that SQL Server is configured to
allow remote connections. (provider: SQL Network Interfaces, error: 26
– Error Locating Server/Instance Specified)

My configuration file has the following EF configuration:

<defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
  <parameters>
    <parameter value="v11.0" />
  </parameters>
</defaultConnectionFactory>

Any advice? I’d prefer to be using Localdb rather than SQL Server Express.

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1 Answer

  1. Editorial Team

    What it turned out to be, for some reason the GUI app.config referenced SqlConnectionFactory not LocalDbConnectionFactory. Fixing this up solved it.

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