httpclient.executeMethod(GetMethod)时报Connection timed out的错误？

HttpClient client = new HttpClient();
String url="http://243.342.45.16/Login.aspx?user=zhangsan&pwd=888";
GetMethod oGet = new GetMethod(url);
httpclient.executeMethod(oGet) //执行到这报下面说的错
上面这段代码是用HttpClient这个包实现登陆网站，然后搜索网页里的内容的功能。之前用没问题，现在报java.net.SocketException: Connection timed out:could be due to invalid address的错误。是不是那边的登陆网页改登陆方式了？需要怎么修改才能登陆上去呢？