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:

GOOD: