MSSQL's JDBC random connection refused

Question

I am having a random "unable to connect" error from my java application. Sometimes it's fine, apps running without any problem, but sometimes this exception comes up. I am writing this app at home and my SQL server is at office (behind a router with SPI firewall, but i have port forwarded TCP port 1433 for the connection). If I telnet to SQL server, i wont get any error message but a blank screen, it looks like the server side is waiting for my console input.
IDE: NetBeans IDE 6.0 (Build 200711261600)
JavaSDK: 1.6.0 build 1.6.0_03-b05
MSSQL JDBC Driver: should be latest (i downloaded off from MS website in early March)
MSSQL: MS SQL 2005 Developer Edition
com.microsoft.sqlserver.jdbc.SQLServerException: The TCP/IP connection to the host has failed. java.net.ConnectException: Connection refused: connect
any help would be appreciated
Jimmyson

Answer 1

this is a sample of my JDBC code:
    private boolean isOnline()
        Connection myConnection = null;
        String myServerPath =      "jdbc:sqlserver://" + dbAddress + ":" + dbPort + ";" +
                    "databaseName=" + dbDefaultDB + ";user=" + dbUsername +
                    ";password=" + dbPassword;
        try
            Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
            myConnection = DriverManager.getConnection(myServerPath);
            myConnection.close();
            return true;
        catch (Exception e)
            e.printStackTrace();
            return false;
    }Sorry if my code is bad
Edited by: istudio on Mar 27, 2008 6:23 AM for formatting issue