A Network-related Or Instance-specific Error In SQL Server Management Server?

Mar 13, 2011

I try to login to SQL Server Management Studio, using Windows Authentication and I get the error message:

Cannot connect to L-VAIOsqlexpress.

------------------------------

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)

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