Troubleshoot connecting to the SQL Server Database Engine

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.

(provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 53)

SQL SERVER 2008
SQL SERVER 2014
SQL SERVER 2016

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