Check if the SQL Server Service is running.
Check the below link to for additional steps to solve this error:
http://sqlserverlearner.com/2012/causes-for-network-related-errors-in-sql-server
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Check if the SQL Server Service is running.
Check the below link to for additional steps to solve this error:
http://sqlserverlearner.com/2012/causes-for-network-related-errors-in-sql-server