Provider: Named Pipes provided, ERROR:40-unable to open SQL Server contact

Lee and server connection errors.

at the time of connection to SQL Server 2005. In the default setting, SQL Server does not agree with remote connections that may cause this failure. (provider: Named Pipes provided, ERROR:40-unable to open SQL Server contact) Description: during the current WEB request run. An unhandled exception occurred.

Check the stack trace information for specific information about the error and the source of the error in your code.

Exception Specific information: System.Data.SqlClient.SqlException: An error occurred while establishing a connection to the server. When you connect to SQL Server 2005. Under the default settings, SQL Server does not agree that remote connections may cause this failure. (provider: Named pipe provider, ERROR:40-Unable to open connection to SQL Server)

I haven't executed SQL Server for a long time. Today made a foolish mistake:

is no start service, haha do not laugh, open the service command is:net start mssqlserver ; The Shutdown service is:net stop mssqlserver

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Provider: Named Pipes provided, ERROR:40-unable to open SQL Server contact