API Express Cannot connect to database with Amazon RDS MySQL DB / POSTGRES DB

Hey!

I created an mysql db from scratch with RDS.

But it's not possible to connect.
I changed the firewall of amazon to allow ALL.
From my pc I can work on the database with mysql workbench, creating tables and data.
Also from the zoho.com and appsheet.com appbuilder it's possible to connect. So the problem is at appery.io

here the credentials:

mydb.chhjbbdigtwx.us-east-2.rds.amazonaws.com
master
password

I got the message: Cannot connect to database. Check connection credentials and try again.

Before I changed the firewall I got the error message: Internal Server Error.

tried also Postgres but its the same.
Tried different region but its the same.

In RDS CloudWatchLog Groups/aws/rds/instance/mydb/error
Is no connection from apperyio written.



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