By default every oracle instances come with 2 firewall.
Hardware Firewall (Known as VCN)
Software Firewall (They use a very hard iptables rules and regular ufw doesn't work with that.)
The 2nd option is very annoying and also took me about 3 days to solve my problem. You can follow my following instructions and hopefully it will also fix your problem.
1st you have to open the port on the Hardware Firewall (VCN) and when you believe you have opened the port then by login to the server using ssh use this command to clear the default oracle iptables rule.
sudo iptables -F
But remember whenever you will reboot the server you will need to again run the flash command. So if you don't want to run this command every time after server reboot. Then after running the flash command run this command to save your flashed iptables rules.
sudo netfilter-persistent save
So, you will not need to run the iptables falsh command every time on the startup of the server.
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默认情况下，每个 Oracle 实例都配有 2 个防火墙。
第二个选项非常烦人，也花了我大约 3 天的时间来解决我的问题。您可以按照我的以下说明进行操作，希望它也能解决您的问题。
首先，您必须打开硬件防火墙 (VCN) 上的端口，当您认为已打开该端口时，请使用 ssh 登录服务器，使用此命令清除默认的 oracle iptables 规则。
但请记住，每当您重新启动服务器时，您都需要再次运行 flash 命令。因此，如果您不想每次服务器重新启动后都运行此命令。然后运行 flash 命令后运行此命令来保存刷新的 iptables 规则。
因此，您不需要每次在服务器启动时都运行 iptables falsh 命令。
By default every oracle instances come with 2 firewall.
The 2nd option is very annoying and also took me about 3 days to solve my problem. You can follow my following instructions and hopefully it will also fix your problem.
1st you have to open the port on the Hardware Firewall (VCN) and when you believe you have opened the port then by login to the server using ssh use this command to clear the default oracle iptables rule.
But remember whenever you will reboot the server you will need to again run the flash command. So if you don't want to run this command every time after server reboot. Then after running the flash command run this command to save your flashed iptables rules.
So, you will not need to run the iptables falsh command every time on the startup of the server.