App Connection Error

Question

I have set up a simple server side application to consume from any client on the internet.
However, I keep getting connection timedout/refused errors. when I try to test from a app test platform (POSTMAN) when the app is running on the active EC2 instance.
The EC2 instance is a Linux machine where I have also installed all the dependencies of the server application built with python, I have set athe network secuirty parameters as recommended during the set up or basically left it at default values, I have configured the ACL rules for inbounds and outbounds to accommodate and direct http, https, ssh to go to port: 5000 as configured in the app config files (config.py). But I can't get to consume the apis on the server. How can I get connect to it while using the free tier resource ?

Answer

Hello.

What are the specific settings for the EC2 security group?  
In particular, this time, if the API listening port is not allowed in the security group's inbound rules, a timeout error will occur.  
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/working-with-security-groups.html#adding-security-group-rule

Also, does EC2 have a public IP address set?  
In that case, please make sure that the route to the Internet gateway is set in the route table of the subnet where EC2 is running.  
https://docs.aws.amazon.com/vpc/latest/userguide/VPC_Route_Tables.html

If you have configured a network ACL on the subnet, please configure it to allow the API listening port for inbound and ephemeral ports (1024 to 65535) for outbound.  
https://docs.aws.amazon.com/vpc/latest/userguide/vpc-network-acls.html

App Connection Error

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