Currently, I have two running EC2 instances. One is running a Postgres server and the other is hosting a NodeJS app that needs to connect to the Postgres database. However, it appears that the connection cannot be established as I am unable to ping the Postgres instance from the app instance (using the public IP of the instance as the destination). I suspect that this issue may be related to the firewall settings. How can I configure the firewall to allow access from one instance to the other?
The likely cause of this problem is related to the Security Group settings. To resolve it, navigate to the AWS Web Console and locate the EC2 instance running Postgres. Check the attached Security Group and ensure that inbound access is granted for port 5432.
In addition, keep in mind that ICMP requests cannot reach EC2 instances unless the corresponding port is allowed in the Security Groups.
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