redis getaddrinfo ENOTFOUND – node.js，redis连接

嗨即时尝试连接到redis从node.js这是成功的，现在我托pipe我的node.js服务器应用程序上的亚马逊ec2实例和redis上的亚马逊弹性caching实例的连接到redis是成功的，但一旦我得到下面提到的错误。

var pub = redis.createClient(6379,'quizredis.qnsdtp.0001.apse1.cache.amazonaws.com'); events.js:72 throw er; // Unhandled 'error' event ^ Error: Redis connection to quizredis.qnsdtp.0001.apse1.cache.amazonaws.com:6379 failed - getaddrinfo ENOTFOUND at RedisClient.on_error (/home/ec2-user/roomChat-7/node_modules/redis/index.js:196:24) at Socket.<anonymous> (/home/ec2-user/roomChat-7/node_modules/redis/index.js:106:14) at Socket.EventEmitter.emit (events.js:95:17) at net.js:813:16 

我使用redis-npm模块;