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If you're not using yet, consider using the SQLServerDataSource to set your server configurations. Also, check if the server is accepting TCP/IP connections and if there's no firewall blocking the connections.
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com.microsoft.sqlserver.jdbc.SQLServerException: The TCP/IP connection to the host GAUTAM-VAIO, port 1433 has failed. Error: "null. Verify the connection properties. Make sure that an instance of SQL Server is running on the host and accepting TCP/IP connections at the port. Make sure that TCP connections to the port are not blocked by a firewall.".