Microsoft SQL Server is a relational database management system developed by Microsoft. As a database server, it is a software product with the primary function of storing and retrieving data as requested by other software applications�which may run either on the same computer or on another computer across a network (including the Internet).
InfoCaptor works with SQL Server using jTDS jdbc driver. http://jtds.sourceforge.net/
Some more information on connection issues with SQL server http://www.infocaptor.com/dashboard/jdbc-with-sqlserver-connection-refused-connect