Hello Aravind,
Please go though the below document,
https://docs.mendix.com/refguide/external-database-connection/
Specific to AWS we have this below platform supported module from Mendix
https://docs.mendix.com/appstore/aws-modules/
Hope this helps,
Thanks & Regards,
Manikandan K
Hi Aravind,
we have the Aws RDS Postgrres DB which is set public accessible as No
we are connecting it with VPN , In your RDS region VPC settings you will get option to create VPN and define your mendix app network IP's l.
Mendix IP's you can find from mendix documents region wise.
Good luck!