Heroku Mongohq nodejs将无法连接

Question

我已经尝试了一切来连接 - 我替换了真实的用户名和密码而不是MONGOLAB_URI而且没有用，我已经尝试了下面的内容但它仍然无法连接

var http = require ('http'); 
var mongoose = require('mongoose');


var uristring =
process.env.MONGOLAB_URI ||
process.env.MONGOHQ_URL ||
'mongodb://localhost/clioflict';


// Makes connection asynchronously.  Mongoose will queue up database
// operations and release them when the connection is complete.

mongoose.connect(uristring, function (err, res) {
  if (err) {
  console.log ('ERROR connecting to: ' + uristring + '. ' + err);
  } else {
  console.log ('Succeeded connected to: ' + uristring);
  }
});

这是错误消息：

错误：连接到数据库时出错 2013-11-25T02：04：02.076149 + 00:00 app [web.1]：抛出新错误（'连接数据库错误＆lt;'+ err +'＆gt;'）;

任何建议？