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You say you have added a security group with multiple rules. If you mean you created one, then from your RDS screen shot it’s NOT configured to use this new security group. You’ll see RDS is using the default security group.
Other thing to note a public RDS instance needs to be in a Public subnet.
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I have checked the 'default (sg-etc) security group and it does have the inbound rules that I have specified. How would I make sure that the rds is in a public subnet?
When you create your subnet group in RDS you define which subnets are part of the group. Check that the subnets in the database subnet group are correct. (Public) https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_VPC.WorkingWithRDSInstanceinaVPC.html#USER_VPC.Subnets