Unable to connect the SQL Server Instance – 26 – Error Locating Server/Instance Specified

Problem\Issue: User is not able to connect the SQL Server Named Instance ServerName\InstanceName Additional Error Messages: 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: SQL Network Interfaces, error: 26 – Error Locating Server/Instance Specified) (Microsoft SQL Server, Error: -1) Environment: SQL Server default single instance is running on

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