Access RDS from T2 instance

Question

I have an already existing RDS instance created an year ago.

I recently created an EC2 instance of type t2. I am unable to access the RDS instance from t2 instance.

Is there a way to do so ?

Answer 1

Check the DB security group

The DB security group must authorize access from the EC2 instance (recommended to give permission to the EC2 security group).