TITLE: Connect to Server

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Hi, the following error has occured.....!!!!! server is running and protocols are also enabled.

Named instance is working but default instance is not.

Cannot connect to SINDU-PC\MSSQLSERVER.

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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: SQL Network Interfaces, error: 25 - Connection string is not valid) (Microsoft SQL Server, Error: 87)