Why might the connection to the AWS RDS database not work?

Question

MySQL

I am creating a database on AWS RDS. When you first created the database, mySQL specified VPC default, the connection was made.
Then I created another VPC, with Internet Gateway, public subnet with assign public IP, bound route table with 0.0.0.0/0 to internet gateway.
I changed the created VPC database to a new one, the security group chose default, but the connection to the database was lost.
After that, I decided to roll back and connect to the default VPC, but the connection did not appear.
Created a new database with default VPC - no connection. Public accessibility is enabled in all cases.
In the default security group, everything seems to be ok too, All traffic, all port, all protocol on 0.0.0.0/0
Network ACLs also allow on 0.0.0.0/0
connected both through datagrid and through mysql workbench the result is one
Region us-east

Answer 1

You cannot connect to the RDS client from the desktop directly. Use SSH tunnel in workbench settings through your EC2 instance