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Does the Oracle RDS instance have a security group that has the correct inbound port open? This is almost certainly TCP port 1521, and should be open for your IP, or wherever you are connecting from (EC2 instance, etc.). It's often best to open this to the world - 0.0.0.0/0 - while troubleshooting, and you can always tighten it up later.
It would also be worth double-checking that the instance was provisioned in a subnet group comprised of all public subnets - a public subnet is one that is reachable from the internet, i.e. has a route in its route tabe to an internet gateway.
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You've hit the nail on the head! That's exactly what was missing. I modified the Security Group and it worked. As it's a temporary and one-off thing, I'll go back to the default settings soon. Thank you!