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端口已在 ubuntu 服务器中允许并打开，但在检查端口时，端口似乎已关闭

tag-icon • tag-icon networking server iptables firewall nginx
端口已在 ubuntu 服务器中允许并打开，但在检查端口时，端口似乎已关闭

我使用 ufw 打开了 5055、8082 和 5013 端口。它显示状态：活动

To                         Action      From
--                         ------      ----
Nginx HTTP                 ALLOW       Anywhere                  
8082                       ALLOW       Anywhere                  
5013                       ALLOW       Anywhere                  
5055                       ALLOW       Anywhere                  
5013/tcp                   ALLOW       Anywhere                  
5013/udp                   ALLOW       Anywhere                  
5055/tcp                   ALLOW       Anywhere                  
5055/udp                   ALLOW       Anywhere                  
22                         ALLOW       Anywhere                  
80                         ALLOW       Anywhere                  
8000                       ALLOW       Anywhere                  
2021                       ALLOW       Anywhere                  
Nginx HTTP (v6)            ALLOW       Anywhere (v6)             
8082 (v6)                  ALLOW       Anywhere (v6)             
5013 (v6)                  ALLOW       Anywhere (v6)             
5055 (v6)                  ALLOW       Anywhere (v6)             
5013/tcp (v6)              ALLOW       Anywhere (v6)             
5013/udp (v6)              ALLOW       Anywhere (v6)             
5055/tcp (v6)              ALLOW       Anywhere (v6)             
5055/udp (v6)              ALLOW       Anywhere (v6)             
22 (v6)                    ALLOW       Anywhere (v6)             
80 (v6)                    ALLOW       Anywhere (v6)             
8000 (v6)                  ALLOW       Anywhere (v6)             
2021 (v6)                  ALLOW       Anywhere (v6)

但是从外部检查端口时它似乎已关闭..任何帮助和建议都将非常有帮助...谢谢！

答案1

打开网络端口意味着有应用程序/进程在该端口上接受连接。ufw您提供的输出仅表示当有东西试图连接到该端口时防火墙不会干预，并不意味着端口会自动打开。打开端口是应用程序的责任。

考虑以下两个例子：

$ nmap -p 5566 localhost 
Starting Nmap 7.70 ( https://nmap.org ) at 2019-03-10 15:06 CST
Nmap scan report for localhost (127.0.0.1)
Host is up (0.00021s latency).

PORT     STATE  SERVICE
5566/tcp closed unknown

Nmap done: 1 IP address (1 host up) scanned in 0.22 seconds

现在如果我启动一个应用程序nc -l 5588

$ nmap -p 8866 localhost 
Starting Nmap 7.70 ( https://nmap.org ) at 2019-03-10 15:07 CST
Nmap scan report for localhost (127.0.0.1)
Host is up (0.00021s latency).

PORT     STATE SERVICE
5566/tcp open  unknown

Nmap done: 1 IP address (1 host up) scanned in 0.18 seconds

也可以看看维基百科上关于该主题的文章。

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