Succesful deployment on Windows server but still can't access app

After creating a pipeline with CodePipeline with all the attendant resources (CodeCommit, CodeDeploy, EC2, IAM Roles, etc.), my pipeline has run successfully but I still can't access my EC2 instance online ("This site can't be reached error").

My code is very simple, I just want to run a starter app to learn how to use the pipeline; in fact, I'm using the SampleApp_Windows structure downloaded from this Github repo https://github.com/quangit/aws-codedeploy-samples-master/tree/master/applications. I didn't change anything in the code and my pipeline is showing success in all of the stages. But when I try to access the EC2 instance via the public DNS address provided, nothing happens.

I've already gone through the process of successfully deploying the SampleApp_Linux from the same Github repository and was able to access the app there (and since I'm using the same security group on my new Windows instance I don't think it's a firewall issue), so I really don't know what the issue could be other than there's something about how a Windows server works with CodePipeline that I don't know.

Any ideas would be appreciated!