How to connect ASP.Net website to PostgreSQL database on remote server

Hello, i really don't know that i should ask it here or not.

but lets see..

I have amazon cloud aws, i am developing a website in asp, i have remote RDP access to my server..

So i have not installed postgreSQL etc.. but i am unable to connect to that database..

and when i install and run on my local system, it connect.

please anyone advice.