SQL Server allows three options of connection: TCP/IP, IPX/SPX and PIPE. However, Intelligent Converters software can only connect to SQL Server through TCP/IP protocol. So, make sure it is enabled through SQL Server Configuration Manager as follows:
If SQL Server is running on another machine, it must allow remote connections. See How to enable remote connections in SQL Server article for more details.
If SQL Server is configured on a custom port (other than 1433), it is
possible to specify port on "Connect to SQL Server" wizard page
in "SQL Server" field as follows: Sql_server_name,1234
In case there is no connection make sure that SQL Server is running:
If you still can not connect, check the firewall settings.
If you are connecting to Azure SQL, see How to connect to Azure SQL article for related information.
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See also
Useful SQL Server Queries
Execution Plans in SQL Server
Improve Performance of SQL Queries