How to connect to Mongodb Atlas Cluster from an EC2 application

Question

Though I can connect to my Mongodb Atlas Cluster , from my express app on a local machine through the following connection string, but cannot connect when the same app is running on an EC2 .

mongodb+srv://<<username>>:<password>@cluster0.xxxx.mongodb.net/myFirstDatabase?retryWrites=true&w=majority

Have set both inbound and outbound rules on EC2 as "allowed from anywhere" for ssh/http/https/allTCP on both ipv4/ipv6

Answer 1

Resolved. While transferring my app files from local machine to EC2, the.env file did not get transferred. I had used scp -r... to transfer the app folder.