直接用的mongdb控制台页面给的命令：mongo --host *.mongodb.rds.aliyuncs.com:3717 --authenticationDatabase admin -u root -p 输入密码后，错误为：W NETWORK [thread1] Failed to connect to *:3717 after 5000ms milliseconds, giving.....

问答 2017-04-28 来自：开发者社区

阿里云专有网络如何使用SMTP连接QQ邮箱发送邮件

我在主机装了 Discuz ，怎么设置都无法发送邮件，我在主机中用 Python 连接 smtp 也永远是超时，ping smtp.qq.com 是正确的，就是连接 smtp永远超时，这个问题不知道该如何解决。

问答 2017-02-16 来自：开发者社区

ECS专用网络启用zookeeper时无法连接

,同样的配置在本地服务器上就可用，但挂上云服务器上就不能用，之前用云服务器搭过，不过当时是花钱买的，网络是经典网络，而这次的服务器是免费领取的，网络是专用网络，是因为这个导致的吗，求助大神。

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专有网络 VPC 帮助您基于阿里云构建出一个隔离的网络环境，并可以自定义IP 地址范围、网段、路由表和网关等；此外，也可以通过专线/VPN/GRE等连接方式实现云上VPC与传统IDC的互联，构建混合云业务。

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