Hi Mike,
I'd like to clarify a few things. Is the server to mirror an existing website, and are you trying to connect to a database stored locally? Also, are you able to get it working using a connection string like the following that specifies an mdf file?
connectionString="Data Source=.\SQLEXPRESS;Integrated Security=True;Database=MobileProfile;AttachDBFilename=|DataDirectory|MobileProfile.mdf;User Instance=True;Asynchronous Processing=True;"
Thanks,
Tom