A network-related or instance-specific error occurred while establishing a connection to SQL Server. Server not found or unreachable

A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or could not be accessed. Verify that the instance name is correct, and that SQL Server is configured to allow remote connections. (provider: Named pipe provider, ERROR:40-Unable to open a connection to SQL Server) "See someone on the Internet using localhost to replace the machine with the server (local), but still not, and then reset the IP itself." As follows: The following steps require some prerequisites: Your SQL Server service is installed and you cannot find the name

1. Open SQL Server Management Configurator

2, click on the MSSQLServer protocol, on the right side of the page select TCP/IP protocol

3. Restart Service

A network-related or instance-specific error occurred while establishing a connection to SQL Server. Server not found or unreachable