Unable to connect to RDS database

Question

My connection just time out.  
  
Following their troubleshooting documentation, I tried to telnet to it, and it seems it is a DNS problem, because I can't resolve that address locally:  
  
$ telnet myinstanaddresshere.us-west-2.rds.amazonaws.com 3306  
Trying 52.30.21.1...  
telnet: connect to address 52.30.21.1: Operation timed out  
telnet: Unable to connect to remote host  
  
I set my db to be public, in the config, do I also need to specify the ip address I am connecting from somewhere?  
  
My ip address is not static, so that would be a problem, if so.

Answer

Nevermind!  
  
Security groups. The Default won't do.  
  
This video helped:  
  
https://www.youtube.com/watch?v=RerDL93sBdY

Unable to connect to RDS database

Relevant questions

How to connect to RDS from DBeaver

Connection to MariaDB server gets a timeout, out of nowhere.

Exporting a database to AWS

We lost access to i-037efcb963119d88a and cant reboot it

cant ssh from linux kali to my lightsail ubuntu

EKS pod sometimes success connect to RDS cluster, but sometimes failed. How can I fix it?

rds connection from telnet or pgAdmin - what host?