وقتی وارد SQL Server می شم با پیغام زیر روبرو می شوم !

[rasol_afkham]

وقتی وارد SQL Server می شم با پیغام زیر روبرو می شوم ! , و به دیتابیس وصل نمی شه. لطفا کمک کنید.

TITLE: Connect to Server
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Cannot connect to RASOL-PC\RASOL.

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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: 26 - Error Locating Server/Instance Specified) (Microsoft SQL Server, Error: -1)

For help, click: http://go.microsoft.com/fwlink?ProdN...1&LinkId=20476 (http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&EvtSrc=MSSQLServer&EvtID=-1&LinkId=20476)

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BUTTONS:

OK
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[micro24]

سلام
لینک زیر را ببینید
http://blog.sqlauthority.com/2009/05/21/sql-server-fix-error-provider-named-pipes-provider-error-40-could-not-open-a-connection-to-sql-server-microsoft-sql-server-error/