JZ006：Caught IOException：java.net.ConnectException：连接被拒绝了？

Question

当我使用以下代码连接sybase ASE 16时，出现错误：

  

JZ006：Caught IOException：java.net.ConnectException：Connection   拒绝

代码是：

package sybase;

import java.sql.*; 
import java.util.*;
public class Conn2ASE {
public static void main(String[] args) {
    try {
        Class.forName("com.sybase.jdbc3.jdbc.SybDriver").newInstance();
        String url = "jdbc:sybase:Tds:192.168.100.120:5000/master";
        Properties sysProps = System.getProperties();
        sysProps.put("user", "sa");
        sysProps.put("password", "560128");
        Connection conn = DriverManager.getConnection(url, sysProps);
        Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
        String sql = "select id,name,crdate from dbo.sysobjects where type='U'";
        ResultSet rs = stmt.executeQuery(sql);
        while (rs.next()) {
            System.out.println("oject_id:"+rs.getString(1)+",oject_name:"+rs.getString(2)); 
        }
        rs.close();
        stmt.close();
        conn.close();
    } catch (Exception e) {
        System.out.println(e.getMessage());
    }
    }
}

有什么问题？有谁能告诉我？