Java Database Connectivity (JDBC)

I'm t rying to connect to a SyBase database with the code below. I get three results with equal distribution:

1) It gets through and makes the connection - I'm golden
2) I get:
Exception: JZ006: Caught IOException: java.net.SocketException: Connection aborted by peer: socket write error
3) I get:
Exception: JZ0C0: Connection is already closed.

Anybody using SyBase with JDBC seen this before?

	private Connection connectToSyBase( String username, String password, String ipAddress, int port )
					throws SQLException
	{
		Connection con = null;				// For return
		String url = null;
		try {
			// Load and register the Sybase driver, if not already done
			loadSyBaseDrivers();

			// Establish a connection
			//		"jdbc:sybase" => identifies the driver
			//		"Tds" => the Sybase communication protocol for Adaptive Server
			//		"host:port/database" => the Adaptive Server hostname and listening port
			url = "jdbc:sybase:Tds:" + ipAddress + ":" + port;
			System.out.println( "ConnectionFactory.connectToSyBase: getConnection" );
			con = DriverManager.getConnection( url, username, password );
			System.out.println( "ConnectionFactory.connectToSyBase: success!" );
		} catch( Exception e ) {
			String msg = "Exception: " + e.getMessage();
			System.out.println( "ConnectionFactory.connectToSyBase: " + msg );
			throw new SQLException( msg );
		}

		// We're golden - return the Connection
		return con;
	}


	/**
	 *	Load SyBase drivers
	 */
	private void loadSyBaseDrivers()
					throws SQLException
	{
		if( _sybDriver == null ) {
			try {
				System.out.println( "ConnectionFactory.loadSyBaseDrivers: load SybDriver" );
				_sybDriver = (SybDriver)Class.forName("com.sybase.jdbc2.jdbc.SybDriver").newInstance();
				System.out.println( "ConnectionFactory.loadSyBaseDrivers: set VERSION" );
				_sybDriver.setVersion( com.sybase.jdbcx.SybDriver.VERSION_5 );
				System.out.println( "ConnectionFactory.loadSyBaseDrivers: registerDriver" );
				DriverManager.registerDriver( _sybDriver );
			} catch( InstantiationException ie ) {
				// All exceptions get rethrown as SQLException
				String msg = "InstantiationException: " + ie.getMessage();
				System.out.println( "ConnectionFactory.loadSyBaseDrivers: " + msg );
				throw new SQLException( msg );
			} catch( ClassNotFoundException cnfe ) {
				String msg = "ClassNotFoundException: " + cnfe.getMessage();
				System.out.println( "ConnectionFactory.loadSyBaseDrivers: " + msg );
				throw new SQLException( msg );
			} catch( SQLException e ) {
				String msg = "SQLException: " + e.getMessage();
				System.out.println( "ConnConnectionFactory.loadSyBaseDriversectionFactory: " + msg );
				throw new SQLException( msg );
			} catch( Exception e ) {
				String msg = "Exception: " + e.getMessage();
				System.out.println( "ConnectionFactory.loadSyBaseDrivers: " + msg );
				throw new SQLException( msg );
			}
		}
	}