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Applies to: 
SQL Server
This article describes how to test connectivity to an instance of SQL Server, using the sqlcmd utility.
Sign in to the default instance of SQL Server
From a command prompt, enter the following command to connect by using Windows Authentication:
sqlcmd [/E] [/S servername]
Sign in to a named instance of SQL Server
From a command prompt, enter the following command to connect by using Windows Authentication:
sqlcmd [/E] /S servername\instancename