Redis - ECONNREFUSED.即使服务器正在运行

我已经阅读了有关ECONNREFUSED错误的stackoverflow上的所有其他线程但仍然无效.目前我正在研究Ubuntu 12.04.1 LTS

对于测试,我有这个非常简单的代码:

var redis = require("redis"),
    client = redis.createClient(6379,"127.0.0.1");

redis.debug_mode = true;

client.on("connect", function () {
    client.set("foo_rand000000000000", "some fantastic value");
});

但每当我启动它时,我得到的只是ECONNREFUSED错误:

root@oncn05:~/ba# node test.js
hiredis parser not installed.
Redis connection to 127.0.0.1:6379 failed - connect ECONNREFUSED

node.js:201
    throw e; // process.nextTick error, or 'error' event on first tick
          ^
Error: Redis connection to 127.0.0.1:6379 failed - connect ECONNREFUSED
    at RedisClient.on_error (/root/ba/node_modules/redis/index.js:196:24)
    at Socket. (/root/ba/node_modules/redis/index.js:106:14)
    at Socket.emit (events.js:67:17)
    at Array.0 (net.js:319:25)
    at EventEmitter._tickCallback (node.js:192:41)
root@oncn05:~/ba#

问题是:连接到redis没问题redis-cli.

root@oncn05:~/ba# redis-cli
redis 127.0.0.1:6379>

日志也没有显示任何可疑的内容.为什么甚至说没有安装hiredis解析器？我装了它npm install hiredis.但即使我没有.它甚至在哪里使用？

我感谢每一个帮助.