RDS Proxy TimeOut Error

Hello.

The following is a tutorial from the AWS documentation.
https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/rds-proxy-setup.html

I think the following YouTube video is easy to understand.
https://www.youtube.com/watch?v=ULRnn6tIYu8

Since you're getting a timeout error, I thought maybe the RDS Proxy's security group doesn't allow the required IP address.
Also, RDS Proxy can only be used within a VPC, so it cannot be used when connecting from on-premises.
https://repost.aws/knowledge-center/rds-proxy-connection-issues