“这台机没有 80 端口不能建站”——端口到底是什么？
一句话解释
端口是服务的”门牌号”。一个 IP 下有 0–65535 个端口，用来区分不同服务。常见的：
- 80 = HTTP（网页）、443 = HTTPS（加密网页）
- 22 = SSH（远程登录）、3389 = 远程桌面
为什么建站要 80/443
浏览器访问网站默认走 80/443。NAT 小鸡 只给一段非标端口、没有 80/443，所以不能常规建站。
防火墙与端口
防火墙 / 云厂商”安全组”控制哪些端口对外开放。建站要确认 80/443 已放行；服务连不上，先查端口是否被挡。
安全提醒
22 等端口常被全网扫描爆破，建议改非标端口 + 密钥登录，少用密码。
挑合适的在售机型？去 库存监控 按线路 / 地区筛选。
“This VPS doesn’t have port 80 so you can’t host a website” — what exactly is a port?
One-Line Explanation
A port is like a “door number” for a service. Under a single IP address there are 0–65535 ports, each identifying a different service. Common ones:
- 80 = HTTP (web), 443 = HTTPS (encrypted web)
- 22 = SSH (remote login), 3389 = Remote Desktop
Why Website Hosting Needs Ports 80/443
Browsers connect to websites on port 80/443 by default. NAT VPS units only provide a range of non-standard ports and lack 80/443, which is why they can’t be used for conventional website hosting.
Firewalls and Ports
A firewall or cloud provider “security group” controls which ports are open to the outside world. Confirm that ports 80 and 443 are allowed before trying to host a site. If a service is unreachable, always check whether the port is being blocked.
Security Tip
Port 22 is constantly brute-forced by scanners worldwide. It’s strongly recommended to change SSH to a non-standard port and use key-based authentication instead of passwords.
Looking for the right VPS? Go to Stock Monitor and filter by network line / region.
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