浙江龙亿建设有限公司:Java连接SQL SERVER 2000报错,急!

错误如下:
java.sql.SQLException: [Microsoft][SQLServer 2000 Driver for JDBC]Error establis
hing socket.
at com.microsoft.jdbc.base.BaseExceptions.createException(Unknown Source
)
at com.microsoft.jdbc.base.BaseExceptions.getException(Unknown Source)
at com.microsoft.jdbc.base.BaseExceptions.getException(Unknown Source)
at com.microsoft.jdbc.sqlserver.tds.TDSConnection.<init>(Unknown Source)

at com.microsoft.jdbc.sqlserver.SQLServerImplConnection.open(Unknown Sou
rce)
at com.microsoft.jdbc.base.BaseConnection.getNewImplConnection(Unknown S
ource)
at com.microsoft.jdbc.base.BaseConnection.open(Unknown Source)
at com.microsoft.jdbc.base.BaseDriver.connect(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at DbTest.init(DbTest.java:26)
at DbTest.<init>(DbTest.java:18)
at DbTest.main(DbTest.java:44)
源码如下:
import java.sql.*;
public class DbTest
{
Connection con;
Statement sta;
ResultSet rs;

String driver;
String url;
String user;
String pwd;
public DbTest()
{
driver = "com.microsoft.jdbc.sqlserver.SQLServerDriver";
url = "jdbc:microsoft:sqlserver://127.0.0.1:1433;DatabaseName=pubs";
user = "sa";
pwd = "qq";
init();
}
public void init()
{
try
{
Class.forName(driver);
System.out.println("driver is ok");
con = DriverManager.getConnection(url,user,pwd);
System.out.println("conection is ok");
sta=con.createStatement();
rs = sta.executeQuery("select * from authors");

while(rs.next())
{
System.out.println(rs.getString("au_lname"));
}
}
catch(Exception e)
{
e.printStackTrace();
}
}

public static void main(String args[])
{
new DbTest();
}
}