jsp连接sqlserver报异常???????

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我是这样写的
private final static String dbDriver = "com.microsoft.jdbc.sqlserver.SQLServerDriver";

private final static String dbURL = "jdbc:microsoft:sqlserver://127.0.0.1:1433;databaseName=pubs";

private final static String userName = "sa";

private final static String password = "";

Class.forName(dbDriver);
Connection conn = DriverManager.getConnection(dbURL,userName,password);
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(sql);
报异常如下：
java.sql.SQLException: [Microsoft][SQLServer 2000 Driver for JDBC]Error establishing 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>(Unknow

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