httpclient 提交xml

我知道访问的url、id、password，需要把生成的xml以stream的形式post过去，但是我使用了以下方法，始终给我connection time out的错误。请教高手。
public boolean postXMLData(InputStream istream){

//Logger.logMsg(className+">>>>>>>>>postXMLData:begin...........");
boolean flag=false;

HttpClient client = new HttpClient();
PostMethod post = new PostMethod("http://……/receiveXML");
UsernamePasswordCredentials upc = new UsernamePasswordCredentials("id", "pswd");
client.getState().setCredentials(AuthScope.ANY,upc);         
       
        try{    
        post.setDoAuthentication(true);         
     post.setRequestBody(istream);     
        post.setRequestContentLength(EntityEnclosingMethod.CONTENT_LENGTH_CHUNKED);         
        post.setRequestHeader("Content-type", "text/xml; charset=GBK");
        System.out.println("连接成功");
        client.executeMethod(post);
        System.out.println("传输成功");
        post.releaseConnection();
flag=true;
        } catch (Exception e1) {
         logger.error("Exception from method postXMLData() e1 -> " + e1);
        
}finally {
            post.releaseConnection();
            
        }
//Logger.logMsg(className+">>>>>>>>>postXMLData:end...........");
return flag;
}