java +sql sever 2000问题??

import java.sql.*; 
public class TestDB { 
public static void main(String[] args) { 
String driverName = "com.microsoft.jdbc.sqlserver.SQLServerDriver"; 
String dbURL = "jdbc:microsoft:sqlserver://localhost:1433; DatabaseName=pubs"; 
String userName = "sa"; 
String userPwd = ""; 
Connection dbConn; 
try { 
Class.forName(driverName); 
dbConn = DriverManager.getConnection(dbURL, userName, userPwd); 
System.out.println("Connection Successful!"); 
} 
catch (Exception e) { 
e.printStackTrace(); 
} 
} 
} 
我已经将JDBC中lib中的.jar文件加入到CLASSPATH中
 而且也已经装了sql sp3怎么还是出错呢?
C:\>java TestDB
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(DriverManager.java:525)
        at java.sql.DriverManager.getConnection(DriverManager.java:171)
        at TestDB.main(TestDB.java:11)