Entity Framework 5 and Amazon RDS - “The underlying provider failed on Open.”

Question

I have a C# / Entity Framework web application runs fine against a local SQL 2012 db. I copied the db out to a new RDS instance, and can access the db via Visual Studio and

Answer 1

The problem was in the connection string. Specifically, I had "Application Name" and "App" properties in there. Once I removed those, it worked.

BAD:

<add name="MyDbEntities" connectionString="metadata=res://*/MyDb.csdl|res://*/MyDb.ssdl|res://*/MyDb.msl;provider=System.Data.SqlClient;provider connection string=&quot;Data Source=MyDbServer;Initial Catalog=MyDb;Persist Security Info=True;User ID=MyDb;Password=MyPassword;Application Name=MyDb.API.Models;MultipleActiveResultSets=True;App=EntityFramework&quot;" providerName="System.Data.EntityClient" />

GOOD:

<add name="MyDbEntities" connectionString="metadata=res://*/MyDb.csdl|res://*/MyDb.ssdl|res://*/MyDb.msl;provider=System.Data.SqlClient;provider connection string=&quot;Data Source=MyDbServer;Initial Catalog=MyDb;Persist Security Info=True;User ID=MyDb;Password=MyPassword;MultipleActiveResultSets=True&quot;" providerName="System.Data.EntityClient" />