AWS: can't connect to RDS database from my machine

Question

The EC2 instance/live web can connect just fine to the RDS database. But when I want to debug the code in my local machine, I can\'t connect to the database and got this error:<

Answer 1

In my case, when I upgrade the size. The private address of the rds instance fell into a private subnet of the VPC. You can use the article My instance is in a private subnet, and I can't connect to it from my local computer to find out your db instance address.

However, changing the route table didn't fix my issue. What I did finally solve my problem is to downgrade the size and then upgrade the size back. Once the private address falls back to the public subnet. Everything works like a charm.