建立与SQL Server的连接时发生网络相关或特定于实例的错误

I have a simple mvc web site (using the VS internet template) on azurewebsites talking to a SQL Azure database in the same data center. The database at this time is just to do the built-in SimpleMembership Provider. I have already switched from the default App_Data mdf file to Azure SQL. It works fine, but sometimes after a while, it would give:I have a simple mvc web site (using the VS inte