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.
You have a different solution? A short tip here would help you and many other users who saw this issue last week.
- 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.". at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(SQLServerException.java:190)