The underlying provider failed on Open. - Only under IIS

[Former Member]

I'm working with .NET 4 MVC 2 and Entity Framework 4.

When I run my app under VS2010 web server, all works fine. When I try to run in IIS 7, I get this error

The underlying provider failed on Open.

How can I fix this? I tried to run application pool with my user account but I got no effect.

[Former Member · Accepted solution]

Build 2024 was released this days. I'll download it tomorrow and test if it solves my problem.

Thank you.