Oracle has 2 very strict firewalls. You have to open ports from the oracle Web interface (mandatory) and maybe also set rules on your VM.
Yea, its sometimes annoying when you have to manage 2 firewalls (still to this day i find the Oracle interface too messy), but it makes it secure
You didn't say anything about firewall or security list, so did you add rules in the subnet security list of your instance and did you open ports in iptables to allow incoming traffic on NPM port?
See this blog post for more details : https://blogs.oracle.com/developers/post/enabling-network-traffic-to-ubuntu-images-in-oracle-cloud-infrastructure
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