SQL Server Login Issues | SQL Login Error | SQL Login failed

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TITLE: Connect to Server
Cannot connect to .\SQL2012 sql server instance
ADDITIONAL INFORMATION:
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: Shared Memory Provider, error: 40 - Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 2)

The system cannot find the file specified

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