OCI – How To Open Network Ports in Ubuntu
in Linux
Applies to:
Oracle Cloud Infrastructure
Linux x86-64
Goal:
In OCI Ubuntu instances (image Ubuntu-22.04)opening anetwork port in UFW don’t work.
Solution:
Ubuntu 22.04 uses nftableas abackend for UFW.
OCI Ubuntu images are provided witha set of iftables, necessary to guarantee OCI functionality.
If an access to a new network port needs to be opened, it must be opened in UFW but also in iptables.
For example, to open RDP port on a Linux instance, run:
1) UFW:
$ ufw allow 3389/tcp
2) To open the port in iptables:
$ iptables -I INPUT 6 -p tcp -m state --state NEW -m tcp --dport 3389 -j ACCEPT
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