Mengxin recently wanted to learn some knowledge about node servers, so he started a node service on the cloud server (as shown below), but on his local machine through the public IP (http://106.14.188.xxx:3000/) But cannot access 
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Alibaba Cloud? Check if there are any firewall rules similar to those provided by Alibaba Cloud in the service provider's panel. Taking Alibaba Cloud as an example, it does not allow inbound requests beyond port 22 by default
Check the firewall, 3000 is allowed but the port is not
sudo iptables -L
Log in to the Alibaba Cloud management platform and set the port whitelist and permissions
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
