Connection string in plain text and config file

Question

At the moment I have my connectionstrings in plain text in my code for development purposes. Everything works lik a charm. However if I move my connection strings to a remote config file the following sql error appears :

A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections.

I tried printing the connectionstring and it was identical to the one I had in plain text.

ConnString = "Initial Catalog=###;Persist Security Info=True;User ID=###;Password=###";
ConnFromFile = WebConfigurationManager.AppSettings["ConnString"];
Log.Message(ConnString ==ConnFromFile )

This resulted in True.

Answer 1

=> SQL配置管理器，检查tcp / IP，启用命名管道，并且禁用VIA