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

Just burned two hours going through the great solutions on this page. Time for the stupid answer!

I redid my Security Groups, VPC's, Routing Tables, Subnets, Gateways... NOPE. I copy-pasted the URL from the AWS Console, which in some cases results in a hidden trailing space. The endpoint is in a

element, which the browser gives a \n when copying. Pasting this into the Intellij db connector coerces it to a space.

I only noticed the problem after pasting the URL into a quote string in my source code.

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