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我在数字海洋中遇到了有关 ufw ubuntu 防火墙规则的问题，我已经允许从任何地方进入该端口，但仍然无法使用我允许的端口访问我的应用程序。如何以安全的方式为我的应用程序启用 ufw 防火墙规则。谢谢你。

Status: active
Logging: on (low)
Default: deny (incoming), allow (outgoing), disabled (routed)
New profiles: skip

To                         Action      From
--                         ------      ----
22/tcp                     ALLOW IN    Anywhere
80/tcp                     ALLOW IN    Anywhere
443/tcp                    ALLOW IN    Anywhere
Anywhere                   ALLOW IN    134.238.123.131
8080                       ALLOW IN    Anywhere
3000                       ALLOW IN    Anywhere
22/tcp (v6)                ALLOW IN    Anywhere (v6)
80/tcp (v6)                ALLOW IN    Anywhere (v6)
443/tcp (v6)               ALLOW IN    Anywhere (v6)
8080 (v6)                  ALLOW IN    Anywhere (v6)
3000 (v6)                  ALLOW IN    Anywhere (v6)

问题是，我无法通过公共 IP 134.238.123.131:3000 访问我的 MERN 堆栈应用程序，问题是，在我能够访问它之前。它显示无法访问站点，如下所示：

This site can’t be reached
104.248.153.121 took too long to respond.
Try:

Checking the connection
Checking the proxy and the firewall
Running Windows Network Diagnostics
ERR_CONNECTION_TIMED_OUT

ufw防火墙规则状态

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